What is the Intergas Xtend_Split_Manual?

The Intergas Xtend 5 is a 5 kW hybrid split heat pump with an A++ ErP rating and OpenTherm compatibility. It is designed to work in tandem with an existing gas boiler to reduce carbon emissions while maintaining high-temperature heating capabilities when required.

How do I register a Intergas Xtend_Split_Manual with BoilerTag?

Scan the QR code on the BoilerTag sticker after installation. Confirm the model details, which will pre-fill from the appliance catalogue, and record the installation date along with your Gas Safe number. Every future service log becomes a permanent, publicly viewable record of the appliance's history. The first 12 BoilerTag stickers are free for engineers. Order free BoilerTag stickers from the engineer dashboard.

What is the SCOP of the Intergas Xtend 5?

4.0 at 35°C. This Seasonal Coefficient of Performance means that for every 1kW of electricity consumed, the system delivers an average of 4kW of heat over the heating season. This rating applies to low-temperature operation, which is optimal for underfloor heating or oversized radiators.

What refrigerant does the Intergas Xtend use?

R32. The system contains a 0.85kg charge of R32 refrigerant, which has a Global Warming Potential (GWP) of 675. This is significantly lower than older R410A systems, making it more environmentally friendly and compliant with current F-Gas regulations.

What does fault code F001 mean on an Intergas Xtend?

No flow in the central heating circuit for at least 30 minutes. This is a lockout fault. Engineers should check the CH pump, inspect the system for leaks, and verify that the water pressure is between 1 and 3 bar. Reset the device via the WiFi control screen or by holding the indoor unit button for 8 seconds.

What is notification code n011 on the Xtend system?

Communication with the outdoor unit has been lost. This notification usually indicates a wiring issue between the indoor and outdoor units or a power failure at the outdoor unit. Check all connections for breakages or short circuits and verify the outdoor unit's internal status via the control screen.

How loud is the Intergas Xtend outdoor unit?

49 dB(LwA). This sound power level represents the noise at the source. The unit also features a quiet mode to further reduce noise emissions during night-time operation. Engineers should still perform a noise assessment if the unit is installed close to a neighbouring property boundary.

Is the Intergas Xtend OpenTherm compatible?

Yes — the Intergas Xtend is fully OpenTherm compatible. It uses this protocol to communicate with both the external boiler and the Comfort Touch room thermostat. This allows for precise modulation of the heating system and enables weather compensation to maximize efficiency.

What are the dimensions of the Xtend outdoor unit?

689mm high, 968mm wide, and 367mm deep. The outdoor unit (Xtend-HB-AWHPSP05) weighs 43kg. It requires minimum clearances of 150mm behind, 50mm at the sides, and 600mm at the front to ensure adequate airflow and service access.

How long is the warranty on the Intergas Xtend?

1 year. The standard warranty covers parts, provided the installation is registered with Intergas. Regular annual servicing is required to maintain the system's performance and safety, including cleaning the system filter and checking the refrigerant circuit.

What is the minimum flow rate for the Intergas Xtend?

15 litres per minute. The hydraulic system requires this minimum flow rate to prevent cycling and ensure efficient heat transfer. The system uses 22mm pipework and is designed to operate at a maximum pressure of 3 bar.

What does fault code F003 mean on the Intergas XTEND?

Value of external flow sensor T43 too high (>67°C) or Value of flow sensor T03 over 1 minute too high. (> 90 ºC) Likely causes: Check the flow in the system.. Check the flow in the system.

What does fault code F009 mean on the Intergas XTEND?

Memory fault codes. Likely causes: Reset the control unit.; Replace the control unit.. Reset the control unit. Replace the control unit.

What does fault code F010 mean on the Intergas XTEND?

Water temperature too low during defrost function. Likely causes: CH flow too low. Check system flow.. CH flow too low. Check system flow.

What does fault code F018 mean on the Intergas XTEND?

Heat pump type not correctly configured. Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F019 mean on the Intergas XTEND?

Incorrect serial number in memory module. Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F020 mean on the Intergas XTEND?

Incorrect firmware. Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F022 mean on the Intergas XTEND?

Firmware version not compatible Likely causes: Firmware needs an updating.; Consult Intergas Heating Ltd.. Firmware needs an updating. Consult Intergas Heating Ltd.

What does fault code F023 mean on the Intergas XTEND?

XTP controller internal Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F024 mean on the Intergas XTEND?

XTP controller configuration Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F025 mean on the Intergas XTEND?

XTP controller communication Likely causes: Consult Intergas Heating Ltd.. Consult Intergas Heating Ltd.

What does fault code F026 mean on the Intergas XTEND?

Startup Likely causes: Switch off the power at the fused spur for 1 minute, the re-establish.; Replace the control unit.. Switch off the power at the fused spur for 1 minute, the re-establish. Replace the control unit.

What does fault code F037 mean on the Intergas XTEND?

Return sensor T04. Likely causes: Check for any breakages/short circuits in the wiring for the sensor T04.; Check whether the sensor T04 is connected correctly.; Replace the sensor T04.. Check for any breakages/short circuits in the wiring for the sensor T04. Check whether the sensor T04 is connect…

What does fault code F038 mean on the Intergas XTEND?

Flow sensor T03. Likely causes: Check for any breakages/short circuits in the wiring for the sensor T03.; Check whether the sensor T03 is connected correctly.; Replace the sensor T03.. Check for any breakages/short circuits in the wiring for the sensor T03. Check whether the sensor T03 is connected…

What does fault code F039 mean on the Intergas XTEND?

External flow sensor T43. Likely causes: Check for any breakages/short circuits in the wiring for the sensor T43.; Check whether the sensor T43 is connected correctly.; Replace the sensor T43.. Check for any breakages/short circuits in the wiring for the sensor T43. Check whether the sensor T43 is…

What does fault code F040 mean on the Intergas XTEND?

External outdoor sensor T42. Likely causes: Check for any breakages/short circuits in the wiring for the sensor T42.; Check whether the sensor T42 is connected correctly.; Replace the sensor T42.. Check for any breakages/short circuits in the wiring for the sensor T42. Check whether the sensor T42…

What does fault code F050 mean on the Intergas XTEND?

Fault within the outdoor unit Likely causes: Access the control screen for additional information. Access the control screen for additional information

What does fault code F051 mean on the Intergas XTEND?

Fault within the indoor unit Likely causes: Access the control screen for additional information. Access the control screen for additional information

What does fault code F254 mean on the Intergas XTEND?

Bypass mode active Likely causes: Switch off the power at the fused spur then, press and hold the control button whilst re-establishing the power supply to clear the by-pass mode.. Switch off the power at the fused spur then, press and hold the control button whilst re-establishing the power supply…

Intergas Xtend 5 Hybrid Heat Pump

Engineer's overview

The Intergas Xtend 5 is a hybrid split-system heat pump specifically engineered for integration with existing gas boiler installations. The system comprises the Xtend-HB-CUSP05 indoor unit and the Xtend-HB-AWHPSP05 outdoor unit, providing a nominal capacity of 5kW. At an outdoor temperature of 7°C and a flow temperature of 35°C, the unit achieves a COP of 4.68, maintaining a capacity of 3.1kW even when external temperatures drop to -7°C. This performance profile ensures the heat pump can handle the base heating load for most UK semi-detached or terraced properties.

Designed for efficiency, the Xtend 5 carries an ErP rating of A++ at 35°C with a seasonal coefficient of performance (SCOP) of 4.0. The outdoor unit is relatively compact, measuring 689mm in height and 968mm in width, with a weight of 43kg. It operates using 0.85kg of R32 refrigerant, which has a Global Warming Potential (GWP) of 675. Sound power levels are rated at 49 dB(LwA), and the system includes a quiet mode for noise-sensitive environments, facilitating easier compliance with local planning requirements.

Hydraulic requirements include a minimum water flow rate of 15 litres per minute through 22mm pipework. The system is rated for a maximum operating pressure of 3 bar. Electrical installation requires a single-phase 230V supply with a 16A MCB, as the maximum power consumption is 1.8kW. Control is achieved through the Intergas Gateway and the Comfort Touch app, utilizing OpenTherm communication for seamless boiler modulation and weather compensation. This allows the system to adjust flow temperatures dynamically based on external conditions.

Maintenance is streamlined via a dedicated indoor unit weighing only 10kg, which facilitates easy wall-mounting. The system features an automated venting program and comprehensive fault monitoring, including specific codes for flow issues and communication errors. Standard protection includes a 1-year warranty, provided the unit is registered. For engineers, the system supports direct firmware updates and configuration via the WiFi control interface, ensuring the hybrid logic optimizes carbon reduction without sacrificing hot water performance.

XTEND 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/intergas/xtend-split-manual#fault-f001 to jump straight to the entry.

Complete list of fault codes for this Intergas XTEND
Code	Meaning	Details
F001Lockout	No flow in the CH circuit for at least 30 minutes. Show causes & actions Likely causes Check the CH pump. Check the system for leaks. Check the system water pressure. Engineer action Check the CH pump. Check the system for leaks. Check the system water pressure. Reset procedure Use the reset button in the WiFi control screen or press and hold the button on the indoor unit for 8 seconds to reset the device.	Details
F003Lockout	Value of external flow sensor T43 too high (>67°C) or Value of flow sensor T03 over 1 minute too high. (> 90 ºC) Show causes & actions Likely causes Check the flow in the system. Engineer action Check the flow in the system.	Details
F009Lockout	Memory fault codes. Show causes & actions Likely causes Reset the control unit. Replace the control unit. Engineer action Reset the control unit. Replace the control unit.	Details
F010Lockout	Water temperature too low during defrost function. Show causes & actions Likely causes CH flow too low. Check system flow. Engineer action CH flow too low. Check system flow.	Details
F018Lockout	Heat pump type not correctly configured. Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F019Lockout	Incorrect serial number in memory module. Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F020Lockout	Incorrect firmware. Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F022Lockout	Firmware version not compatible Show causes & actions Likely causes Firmware needs an updating. Consult Intergas Heating Ltd. Engineer action Firmware needs an updating. Consult Intergas Heating Ltd.	Details
F023Lockout	XTP controller internal Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F024Lockout	XTP controller configuration Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F025Lockout	XTP controller communication Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
F026Lockout	Startup Show causes & actions Likely causes Switch off the power at the fused spur for 1 minute, the re-establish. Replace the control unit. Engineer action Switch off the power at the fused spur for 1 minute, the re-establish. Replace the control unit.	Details
F037Lockout	Return sensor T04. Show causes & actions Likely causes Check for any breakages/short circuits in the wiring for the sensor T04. Check whether the sensor T04 is connected correctly. Replace the sensor T04. Engineer action Check for any breakages/short circuits in the wiring for the sensor T04. Check whether the sensor T04 is connected correctly. Replace the sensor T04.	Details
F038Lockout	Flow sensor T03. Show causes & actions Likely causes Check for any breakages/short circuits in the wiring for the sensor T03. Check whether the sensor T03 is connected correctly. Replace the sensor T03. Engineer action Check for any breakages/short circuits in the wiring for the sensor T03. Check whether the sensor T03 is connected correctly. Replace the sensor T03.	Details
F039Lockout	External flow sensor T43. Show causes & actions Likely causes Check for any breakages/short circuits in the wiring for the sensor T43. Check whether the sensor T43 is connected correctly. Replace the sensor T43. Engineer action Check for any breakages/short circuits in the wiring for the sensor T43. Check whether the sensor T43 is connected correctly. Replace the sensor T43.	Details
F040Lockout	External outdoor sensor T42. Show causes & actions Likely causes Check for any breakages/short circuits in the wiring for the sensor T42. Check whether the sensor T42 is connected correctly. Replace the sensor T42. Engineer action Check for any breakages/short circuits in the wiring for the sensor T42. Check whether the sensor T42 is connected correctly. Replace the sensor T42.	Details
F050Lockout	Fault within the outdoor unit Show causes & actions Likely causes Access the control screen for additional information Engineer action Access the control screen for additional information	Details
F051Lockout	Fault within the indoor unit Show causes & actions Likely causes Access the control screen for additional information Engineer action Access the control screen for additional information	Details
F254	Bypass mode active Show causes & actions Not a fault code as such, but a forced way to forward the heat request to the boiler. Likely causes Switch off the power at the fused spur then, press and hold the control button whilst re-establishing the power supply to clear the by-pass mode. Engineer action Switch off the power at the fused spur then, press and hold the control button whilst re-establishing the power supply to clear the by-pass mode.	Details
n000	Parameter settings outside range Show causes & actions Likely causes Check the settings. Engineer action Check the settings.	Details
n001	System pressure too low, parameter P020 Show causes & actions Likely causes Check for leaks The system water requires refilling or topping up. Engineer action Check for leaks. The system water requires refilling or topping up.	Details
n008	XTP error heat pump (ODU) Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
n011	Communication with the outdoor unit has been lost or the outdoor unit has an internal . Show causes & actions Likely causes Access the WiFi control screen for additional information Check the wiring between the indoor unit and outdoor unit for breakages/short circuit. Check the connections in the outdoor unit. Engineer action Access the WiFi control screen for additional information. Check the wiring between the indoor unit and outdoor unit for breakages/short circuit. Check the connections in the outdoor unit.	Details
n013	Condenser temperature too high: heating pump disengaged. Show causes & actions Likely causes Potentially insufficient flow. Engineer action Potentially insufficient flow.	Details
n014	Thermostat not connected. Show causes & actions Likely causes Connect the Comfort Touch thermostat; see §8.8.5. Engineer action Connect the Comfort Touch thermostat; see §8.8.5.	Details
n015	Crankcase heater function Show causes & actions Likely causes Possible loose connection to the outdoor unit Faulty resistance element. Engineer action Possible loose connection to the outdoor unit. Faulty resistance element.	Details
n016	Abnormal Delta-T between the flow and return temperature values Show causes & actions Likely causes Sensors T03 and T04 connected or mounted incorrectly. Check the system flow. Engineer action Sensors T03 and T04 connected or mounted incorrectly. Check the system flow.	Details
n018	Problem with memory. Show causes & actions Likely causes Consult Intergas Heating Ltd. Engineer action Consult Intergas Heating Ltd.	Details
n019	Fault memory module Show causes & actions Likely causes Check the wiring. Replace the memory module. Engineer action Check the wiring. Replace the memory module.	Details
n021	No flow in the CH circuit for at least 30 seconds. Show causes & actions Venting program (max. 15 minutes) is started. Other system functions are blocked and resumed after the program has completed. Likely causes Pump turns off for 60 seconds. Pump runs at maximum capacity. If sufficient flow is regained again for 30 seconds, the program will stop and the notification code will clear. Engineer action Venting program (max. 15 minutes) is started.	Details
n022	Problem with automatic flow rate control Show causes & actions Likely causes Probably air in the system, vent. Engineer action Probably air in the system, vent.	Details
n023	System flow too low during commissioning Show causes & actions Likely causes Check the CH-circuit for restrictions, debris, air or isolation valves closed. Engineer action Check the CH-circuit for restrictions, debris, air or isolation valves closed.	Details
n039	Problem with external flow temperature sensor T43 Show causes & actions Likely causes Check the position and connection of the sensor on the flow pipework. Check wiring. Replace if necessary. Engineer action Check the position and connection of the sensor on the flow pipework. Check wiring. Replace if necessary.	Details
n040	Problem with external outdoor sensor T42 Show causes & actions Likely causes Check wiring. Replace if necessary. Engineer action Check wiring. Replace if necessary.	Details
n041	Problem with refrigerant liquid sensor. Show causes & actions Likely causes Check wiring. Replace if necessary. Engineer action Check wiring. Replace if necessary.	Details
n042	Problem with refrigerant gas sensor. Show causes & actions Likely causes Check wiring. Replace if necessary. Engineer action Check wiring. Replace if necessary.	Details
n051	Boiler locked out of system Show causes & actions Likely causes Check for boiler malfunction. Engineer action Check for boiler malfunction.	Details
n052	Error with OpenTherm connection to boiler. Show causes & actions Likely causes Check wiring. Replace if necessary. Engineer action Check wiring. Replace if necessary.	Details
N053	Flow temperature from boiler is too low Show causes & actions Likely causes Set the flow target temperature of the boiler to the same as the maximum flow target temperature of the Xtend or higher (P194). Engineer action Set the flow target temperature of the boiler to the same as the maximum flow target temperature of the Xtend or higher (P194).	Details
N054	Boiler not responding to heating request from Xtend. Show causes & actions Likely causes Check whether the boiler or CH function is turned off. Engineer action Check whether the boiler or CH function is turned off.	Details
N055	Boiler has a notification Show causes & actions Likely causes Resolve the boiler malfunction. Engineer action Resolve the boiler malfunction.	Details
N060	Thermostat firmware version is not up to date if using the Intergas Comfort Touch. Show causes & actions Likely causes Install the latest version of Intergas Comfort Touch. Engineer action Install the latest version of Intergas Comfort Touch.	Details

Common XTEND 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 XTEND no flow in the ch circuit for at least 30 minutes.Lockout

Engineer: Check the CH pump. Check the system for leaks. Check the system water pressure.

Triggered by fault code F001.

How to fix the XTEND value of external flow sensor t43 too high (>67°c) or value of flow sensor t03 over 1 minute too high. (> 90 ºc)Lockout

Engineer: Check the flow in the system.

Triggered by fault code F003.

How to fix the XTEND memory fault codes.Lockout

Engineer: Reset the control unit. Replace the control unit.

Triggered by fault code F009.

XTEND

XTEND at a glance

XTEND

XTEND at a glance

Register this Intergas XTEND on BoilerTag

XTEND data sheet

Engineer's overview

XTEND fault codes

Common XTEND problems & troubleshooting

How to fix the XTEND no flow in the ch circuit for at least 30 minutes.Lockout

How to fix the XTEND value of external flow sensor t43 too high (>67°c) or value of flow sensor t03 over 1 minute too high. (> 90 ºc)Lockout

How to fix the XTEND memory fault codes.Lockout

How to fix the XTEND water temperature too low during defrost function.

XTEND FAQs

Every boiler brochure, free with BoilerTag

Working on a Intergas XTEND?

How to fix the XTEND heat pump type not correctly configured.Lockout

Likely causes that trigger multiple XTEND fault codes

XTEND at a glance

XTEND at a glance

Register this Intergas XTEND on BoilerTag

XTEND data sheet

Engineer's overview

XTEND fault codes

Common XTEND problems & troubleshooting

How to fix the XTEND no flow in the ch circuit for at least 30 minutes.Lockout

How to fix the XTEND value of external flow sensor t43 too high (>67°c) or value of flow sensor t03 over 1 minute too high. (> 90 ºc)Lockout

How to fix the XTEND memory fault codes.Lockout

How to fix the XTEND water temperature too low during defrost function.

XTEND FAQs

What refrigerant does the Intergas Xtend use?

What does fault code F001 mean on an Intergas Xtend?

What is notification code n011 on the Xtend system?

How loud is the Intergas Xtend outdoor unit?

Is the Intergas Xtend OpenTherm compatible?

What are the dimensions of the Xtend outdoor unit?

How long is the warranty on the Intergas Xtend?

What is the minimum flow rate for the Intergas Xtend?

Every boiler brochure, free with BoilerTag

Other Intergas heat pumps

Working on a Intergas XTEND?

How to fix the XTEND heat pump type not correctly configured.Lockout

Likely causes that trigger multiple XTEND fault codes