How do I register a Grant Aerona3_R32_Installer_Manual with BoilerTag?

Scan the QR code on the BoilerTag sticker after installation to register the Grant Aerona³. Confirm the pre-filled model details, record the installation date, and enter your Gas Safe or MCS number to create a permanent, public service log. The first 12 BoilerTag stickers are free for engineers to use on new installations. Order free BoilerTag stickers from the engineer dashboard.

What is the Grant Aerona3_R32_Installer_Manual?

The Grant Aerona³ is a monobloc air-source heat pump available in outputs from 6kW to 17kW, featuring R32 refrigerant and an A+++ ErP rating. It is designed for domestic heating and hot water applications in the UK market.

What is the SCOP of the Grant Aerona³ 6kW?

The SCOP at 35°C is 4.61. This means for every 1kW of electricity consumed, the unit produces 4.61kW of heat over a year. At a 55°C flow temperature, the SCOP is 3.29.

Does the Grant Aerona³ use R32 refrigerant?

Yes, it uses R32 refrigerant. R32 has a lower Global Warming Potential than older R410A systems and requires a 0.8kg charge for the 6kW model. This refrigerant choice helps meet modern environmental standards.

Is the Grant Aerona³ eligible for the BUS grant?

Yes, the Grant Aerona³ is MCS certified. This makes it eligible for the Boiler Upgrade Scheme (BUS) grant in the UK, provided the installation is carried out by an MCS-accredited installer and meets all other scheme criteria.

What is the sound level of the Grant Aerona³?

The sound power level is 65.2 dB(A). Installers should perform an MCS-020 sound assessment to ensure the unit meets Permitted Development requirements regarding distance from neighbouring properties and noise impact.

Is a volumiser tank required for the Grant Aerona³?

Yes, a volumiser tank is required for all Grant Aerona³ installations unless a buffer tank or thermal store is integrated into the system. This ensures the minimum system volume is maintained for efficient defrost cycles.

What does fault code A0 mean on a Grant Aerona³?

Fault code A0 indicates a DC voltage error. Engineers should check the power supply, fuses CF1, CF3, and CF4, and inspect the fan motor, pump, and Main PCB for faults or damage.

What does fault code P1 mean on a Grant Aerona³?

Fault code P1 signifies a pump error. This is usually caused by a faulty pump, a blockage in the water circuit, or a failure in the Main PCB voltage output to the pump unit.

How long is the warranty on a Grant Aerona³?

The warranty is three years in total, consisting of a one-year standard term plus a two-year extension. To qualify, the unit must be registered within 30 days and serviced annually by a qualified engineer.

What is the maximum flow temperature for the Grant Aerona³?

The maximum flow temperature is 60°C. While capable of high temperatures, the unit operates most efficiently at lower flow temperatures, such as 35°C, where it achieves its maximum A+++ ErP rating.

What pipe size is required for the Grant Aerona³?

The required pipe size is 22mm. Using smaller diameter pipework can restrict flow rates below the required 5 litres per minute minimum, leading to efficiency losses or high-pressure errors during operation.

What does fault code A0 mean on the Grant HPID17R32?

DC voltage error Likely causes: Blown fuse; Faulty fan motor; Faulty pump; Faulty reactor; Faulty Main PCB. Confirm power supply; replace blown fuses; replace Main PCB, fan motor, pump, or reactor if faulty

What does fault code A1 mean on the Grant HPID17R32?

Discharge temperature error Likely causes: Faulty discharge temperature sensor; Refrigerant gas leakage. Replace sensor if faulty; collect refrigerant and recharge if leaking

What does fault code A2 mean on the Grant HPID17R32?

Protective action against excess Current DC current detection Likely causes: Air inlet/outlet blockage; Excess refrigerant gas; Low power voltage; Faulty compressor. Clear blockages; adjust refrigerant charge; confirm 230V supply; replace Main PCB or compressor if necessary

What does fault code A3 mean on the Grant HPID17R32?

CT disconnection Likely causes: Faulty Main PCB. Replace Main PCB

What does fault code A4 mean on the Grant HPID17R32?

Protective action against excess Current AC current detection Likely causes: Air inlet/outlet blockage; Excess refrigerant gas; Low power voltage. Clear blockages; adjust refrigerant charge; confirm 230V supply

What does fault code A5 mean on the Grant HPID17R32?

Abnormal revolution of compressor Likely causes: Air blockage; Excess gas; Low voltage; Blown fuse CF6; Clogged water circuit; Faulty compressor. Clear blockages; replace fuse CF6; remove water circuit blockage; replace compressor if necessary

What does fault code A6 mean on the Grant HPID17R32?

Suction temperature sensor error Likely causes: Faulty suction temperature sensor. Replace sensor if faulty

What does fault code A7 mean on the Grant HPID17R32?

Defrost tem sensor error Likely causes: Faulty defrost temperature sensor. Replace sensor if faulty

What does fault code A8 mean on the Grant HPID17R32?

Discharge temp. sensor error Likely causes: Faulty discharge temperature sensor. Replace sensor if faulty

What does fault code C1 mean on the Grant HPID17R32?

Upper fan motor error (HPID17R32) Likely causes: Blown fuse CF7; Faulty fan motor; Faulty Main PCB. Replace fuse CF7; replace fan motor or Main PCB if faulty

What does fault code C2 mean on the Grant HPID17R32?

Outdoor temp. sensor error Likely causes: Faulty outdoor temperature sensor. Replace sensor if faulty

What does fault code C3 mean on the Grant HPID17R32?

Lower Fan motor error (HPID17R32) / Fan motor error (HPID6R32 and HPID10R32) Likely causes: Blown fuse CF6/CF7; Faulty fan motor; Faulty Main PCB. Replace fuse; replace fan motor or Main PCB if faulty

What does fault code C4 mean on the Grant HPID17R32?

Rise of temperature (above 110°C) of Main PCB Likely causes: Air inlet/outlet blockage; Faulty Main PCB. Clear blockages; replace Main PCB

What does fault code C5 mean on the Grant HPID17R32?

Main PCB sensor error Likely causes: Faulty Main PCB. Replace Main PCB

What does fault code C6 mean on the Grant HPID17R32?

Main PCB error Likely causes: Faulty Main PCB. Replace Main PCB

What does fault code C7 mean on the Grant HPID17R32?

Controller PCB serial error Likely causes: Wiring fault; Faulty Controller PCB; Faulty Main PCB; Earth wire issue. Correct wiring; replace Controller or Main PCB; check earth wire

What does fault code C8 mean on the Grant HPID17R32?

Main PCB error Likely causes: Loose reactor connections; Faulty Main PCB. Check reactor cables; replace Main PCB if error persists after power cycle

What does fault code E4 mean on the Grant HPID17R32?

Outgoing water temp. sensor error Likely causes: Faulty outgoing water temperature sensor. Replace sensor if faulty

Grant Aerona³ R32 Heat Pump — Specs, Faults & Manual

Engineer's overview

The Grant Aerona³ R32 is a DC inverter-driven monobloc heat pump, engineered for straightforward installation and high seasonal efficiency. The primary 6kW model (HPID6R32) achieves an ErP rating of A+++ at a 35°C flow temperature and A++ at 55°C, supported by a SCOP of 4.61. With a compact outdoor unit measuring 675mm in height, 825mm in width, and 300mm in depth, it is suitable for installations where external space is limited.

Hydraulic integration requires a minimum pipe size of 22mm and the installation of a volumiser tank for all systems, unless a buffer or thermal store is utilized. The unit operates with a maximum pressure of 3 bar and requires a minimum water flow rate of 5 litres per minute. The system maintains functionality in extreme conditions down to -20°C outdoors and provides a maximum flow temperature of 60°C, making it compatible with both underfloor heating and correctly sized radiator circuits.

For electrical setup, the 6kW variant requires a 230V single-phase supply protected by a 16A MCB. Control compatibility is extensive, including the Grant EP001 wiring centre, EP002 interface relay box, and the NeoStat or Edge series. These controls enable weather compensation, which is vital for optimizing the unit's performance across varying seasonal loads.

The Aerona³ utilizes a reverse cycle defrost method and features a quiet mode to manage its 65.2 dB(A) sound power level. Maintenance is mandatory every 12 months to maintain the extended 3-year warranty, which covers parts and labour if the unit is registered within 30 days of installation. Annual service steps include checking the evaporator fins, testing antifreeze concentrations, and cleaning the magnetic filter.

For engineers, the Aerona³ provides detailed diagnostic feedback via the remote controller. Common issues such as the A0 DC voltage error or the P1 pump error require specific checks of the Main PCB, fuses, and water circuit integrity. The use of R32 refrigerant, with a charge of 0.8kg in the 6kW model, ensures compliance with modern environmental standards while delivering a high COP of 4.91 at A7/W35. This combination of technical reliability and efficiency makes the Aerona³ a standard choice for UK domestic decarbonisation projects.

HPID17R32 fault codes

Every fault code listed in the manufacturer brochure, with likely causes and engineer actions. Each code has a permalink — paste a URL like https://www.boilertag.com/heat-pumps/grant/hpid17r32#fault-a0 to jump straight to the entry.

Complete list of fault codes for this Grant HPID17R32
Code	Meaning	Details
A0Lockout	DC voltage error Show causes & actions Check the power supply, fuses CF1/CF3/CF4, fan motor, pump, reactor, and Main PCB voltage Likely causes Blown fuse Faulty fan motor Faulty pump Faulty reactor Faulty Main PCB User action Contact a qualified service engineer Engineer action Confirm power supply; replace blown fuses; replace Main PCB, fan motor, pump, or reactor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A1	Discharge temperature error Show causes & actions Check discharge temperature sensor resistance and check for gas leakage Likely causes Faulty discharge temperature sensor Refrigerant gas leakage User action Contact a qualified service engineer Engineer action Replace sensor if faulty; collect refrigerant and recharge if leaking Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A2Lockout	Protective action against excess Current DC current detection Show causes & actions Check installation for air blockage, excess gas, power voltage drop, or compressor fault Likely causes Air inlet/outlet blockage Excess refrigerant gas Low power voltage Faulty compressor User action Contact a qualified service engineer Engineer action Clear blockages; adjust refrigerant charge; confirm 230V supply; replace Main PCB or compressor if necessary Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A3Lockout	CT disconnection Show causes & actions Main PCB current transformer disconnection Likely causes Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace Main PCB Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A4Lockout	Protective action against excess Current AC current detection Show causes & actions Check for air blockage, excess gas, or power voltage drop Likely causes Air inlet/outlet blockage Excess refrigerant gas Low power voltage User action Contact a qualified service engineer Engineer action Clear blockages; adjust refrigerant charge; confirm 230V supply Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A5Lockout	Abnormal revolution of compressor Show causes & actions Check for air blockage, excess gas, power voltage drop, blown fuse CF6, or clogged water circuit Likely causes Air blockage Excess gas Low voltage Blown fuse CF6 Clogged water circuit Faulty compressor User action Contact a qualified service engineer Engineer action Clear blockages; replace fuse CF6; remove water circuit blockage; replace compressor if necessary Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A6	Suction temperature sensor error Show causes & actions Check suction temperature sensor resistance Likely causes Faulty suction temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A7	Defrost tem sensor error Show causes & actions Check defrost temperature sensor resistance Likely causes Faulty defrost temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
A8	Discharge temp. sensor error Show causes & actions Check discharge temperature sensor resistance Likely causes Faulty discharge temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C1	Upper fan motor error (HPID17R32) Show causes & actions Check fuse CF7, fan motor voltage, and Main PCB Likely causes Blown fuse CF7 Faulty fan motor Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace fuse CF7; replace fan motor or Main PCB if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C2	Outdoor temp. sensor error Show causes & actions Check outdoor temperature sensor resistance Likely causes Faulty outdoor temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C3Lockout	Lower Fan motor error (HPID17R32) / Fan motor error (HPID6R32 and HPID10R32) Show causes & actions Check fuse CF6/CF7, fan motor voltage, and Main PCB Likely causes Blown fuse CF6/CF7 Faulty fan motor Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace fuse; replace fan motor or Main PCB if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C4Lockout	Rise of temperature (above 110°C) of Main PCB Show causes & actions Check for air blockage or faulty Main PCB sensor Likely causes Air inlet/outlet blockage Faulty Main PCB User action Contact a qualified service engineer Engineer action Clear blockages; replace Main PCB Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C5	Main PCB sensor error Show causes & actions Main PCB temperature sensor fault Likely causes Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace Main PCB Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C6Lockout	Main PCB error Show causes & actions Internal Main PCB fault Likely causes Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace Main PCB Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C7	Controller PCB serial error Show causes & actions Communication error between Main PCB and Controller PCB Likely causes Wiring fault Faulty Controller PCB Faulty Main PCB Earth wire issue User action Contact a qualified service engineer Engineer action Correct wiring; replace Controller or Main PCB; check earth wire Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
C8Lockout	Main PCB error Show causes & actions Check reactor connections and power cycle Likely causes Loose reactor connections Faulty Main PCB User action Contact a qualified service engineer Engineer action Check reactor cables; replace Main PCB if error persists after power cycle Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
E4	Outgoing water temp. sensor error Show causes & actions Check outgoing water temperature sensor resistance Likely causes Faulty outgoing water temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
E5	Return water temp. sensor error Show causes & actions Check return water temperature sensor resistance Likely causes Faulty return water temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
FULockout	High pressure switch is operating Show causes & actions Check for air recirculation or clogged water circuit Likely causes Outside air recirculation Clogged water circuit User action Contact a qualified service engineer Engineer action Ensure air inlet/outlet is clear; remove water circuit blockage Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
P1Lockout	Pump error Show causes & actions Check pump voltage, water circuit blockage, and pump condition Likely causes Faulty pump Clogged water circuit Faulty Main PCB User action Contact a qualified service engineer Engineer action Replace pump or Main PCB; clear water circuit blockage Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
P3Lockout	High pressure switch error (HPID17R32) Show causes & actions Check high pressure switch connections Likely causes Loose connections Faulty high pressure switch User action Contact a qualified service engineer Engineer action Check connections; replace high pressure switch Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
U1Lockout	Compressor overheat protection relay operation (HPID17R32) Show causes & actions Check overheat protection relay and refrigerant charge Likely causes Faulty overheat protection relay Gas leakage User action Contact a qualified service engineer Engineer action Replace relay if blown; recharge refrigerant if leaking Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L0Lockout	EEPROM error Show causes & actions Internal PCB memory fault Likely causes Faulty Controller PCB Faulty EEPROM PCB User action Contact a qualified service engineer Engineer action Replace Controller and EEPROM PCBs Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L1	DHW temperature sensor error Show causes & actions Check DHW tank temperature sensor resistance Likely causes Faulty DHW tank temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L2	Outdoor temperature sensor error Show causes & actions Check outdoor temperature sensor resistance Likely causes Faulty outdoor temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L3	Thermal store temperature sensor error Show causes & actions Check thermal store temperature sensor resistance Likely causes Faulty thermal store temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L4	Mix water temperature sensor error Show causes & actions Check mix water temperature sensor resistance Likely causes Faulty mix water temperature sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
L5	Humidity sensor error Show causes & actions Check humidity sensor resistance Likely causes Faulty humidity sensor User action Contact a qualified service engineer Engineer action Replace sensor if faulty Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
740	Remote controller communication error Show causes & actions Check remote controller wiring or DIP SW setting Likely causes Incorrect wiring Incorrect DIP SW setting Loose cable Faulty Controller PCB User action Contact a qualified service engineer Engineer action Correct wiring and DIP SW settings; replace Controller PCB if necessary Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
E8	Remote controller communication error Show causes & actions Check remote controller wiring and interface cable Likely causes Incorrect wiring Loose interface cable Faulty Controller PCB User action Contact a qualified service engineer Engineer action Correct wiring; replace Controller PCB if necessary Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details
F5	Main PCB communication error Show causes & actions Check Main PCB wiring and interface cable Likely causes Incorrect Main PCB wiring Loose interface cable Faulty Main PCB Faulty Controller PCB User action Contact a qualified service engineer Engineer action Correct wiring; replace Main or Controller PCB if necessary Reset procedure Press – and + buttons on Remote Controller for 3 seconds, or press Reset SW on Terminal PCB	Details

Common HPID17R32 problems & troubleshooting

Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.

How to fix the HPID17R32 dc voltage errorLockout

User: Contact a qualified service engineer

Engineer: Confirm power supply; replace blown fuses; replace Main PCB, fan motor, pump, or reactor if faulty

Triggered by fault code A0.

How to fix the HPID17R32 protective action against excess current dc current detectionLockout

User: Contact a qualified service engineer

Engineer: Clear blockages; adjust refrigerant charge; confirm 230V supply; replace Main PCB or compressor if necessary

Triggered by fault code A2.

How to fix the HPID17R32 ct disconnectionLockout

User: Contact a qualified service engineer

Engineer: Replace Main PCB

Triggered by fault code A3.

HPID17R32

HPID17R32 at a glance

Register this Grant HPID17R32 on BoilerTag

HPID17R32 data sheet

Engineer's overview

HPID17R32 fault codes

Common HPID17R32 problems & troubleshooting

How to fix the HPID17R32 dc voltage errorLockout

How to fix the HPID17R32 protective action against excess current dc current detectionLockout

How to fix the HPID17R32 ct disconnectionLockout

HPID17R32 FAQs

Every boiler brochure, free with BoilerTag

Working on a Grant HPID17R32?

How to fix the HPID17R32 protective action against excess current ac current detectionLockout

How to fix the HPID17R32 abnormal revolution of compressorLockout

Likely causes that trigger multiple HPID17R32 fault codes

HPID17R32 at a glance

Register this Grant HPID17R32 on BoilerTag

HPID17R32 data sheet

Engineer's overview

HPID17R32 fault codes

Common HPID17R32 problems & troubleshooting

How to fix the HPID17R32 dc voltage errorLockout

How to fix the HPID17R32 protective action against excess current dc current detectionLockout

How to fix the HPID17R32 ct disconnectionLockout

HPID17R32 FAQs

Does the Grant Aerona³ use R32 refrigerant?

Is the Grant Aerona³ eligible for the BUS grant?

What is the sound level of the Grant Aerona³?

Is a volumiser tank required for the Grant Aerona³?

What does fault code A0 mean on a Grant Aerona³?

What does fault code P1 mean on a Grant Aerona³?

How long is the warranty on a Grant Aerona³?

What is the maximum flow temperature for the Grant Aerona³?

What pipe size is required for the Grant Aerona³?

Every boiler brochure, free with BoilerTag

Other Grant heat pumps

Working on a Grant HPID17R32?

How to fix the HPID17R32 protective action against excess current ac current detectionLockout

How to fix the HPID17R32 abnormal revolution of compressorLockout

Likely causes that trigger multiple HPID17R32 fault codes