Ferroli
The Ferroli Modena 27 C HE is a 27 kW condensing combi boiler with a 98% seasonal efficiency and a DHW flow rate of 12.9 lpm at a 35°C rise.
The Ferroli Modena 27 C HE is a wall-hung condensing combi boiler designed for domestic heating and hot water in UK properties. Operating on natural gas or LPG, this appliance delivers a maximum central heating output of 24.5 kW and a domestic hot water output of 27 kW. It is primarily researched by UK gas and heating engineers seeking technical specifications, fault codes, and compatibility information for installation and servicing.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
Bottom connections
Ferroli recommends the exclusive use of specific products such as Fernox or Sentinel. System pipes must be flushed to remove residuals or impurities.
The Ferroli Modena 27 C HE is a natural gas and LPG compatible condensing combi boiler, introduced in 2013. It provides a central heating output range of 5.7 kW to 24.5 kW, with a domestic hot water output of 27 kW. The appliance achieves a seasonal efficiency of 98% and is rated as NOx Class 5, demonstrating compliance with modern emissions standards. For domestic hot water, it offers a flow rate of 12.9 litres per minute at a 35°C temperature rise, supported by a preheat feature for user convenience. Installation requires specific clearances and adherence to water quality guidelines, with Ferroli recommending Fernox or Sentinel products. The unit features bottom connections and a compact design, measuring 600mm high, 400mm wide, and 320mm deep, with a dry weight of 29 kg. It is OpenTherm compatible and Boiler Plus compliant, allowing for advanced control integration.
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/boilers/ferroli/modena-27-c-he#fault-a01 to jump straight to the entry.
| Code | Meaning | Details |
|---|---|---|
| A01Lockout | No burner ignition Show causes & actionsLikely causes
Engineer action Check the regular gas flow to the boiler and that the air has been purged from the pipes Check that the electrodes are correctly positioned and free of any deposits Check and change the gas valve Check inlet gas pressure Check and if necessary change the siphon Check the ionising electrode wiring | Details |
| A02Lockout | Flame detected with the burner off Show causes & actionsLikely causes
Engineer action Check the PCB | Details |
| A03Lockout | High limit protection Show causes & actionsLikely causes
Engineer action Check the correct positioning and operation of the flow sensor Check pump and radiator valves present in the system Check operation of the internal by-pass | Details |
| A04Lockout | Flue gas fault Show causes & actionsLikely causes
Engineer action Check the flue | Details |
| A05Lockout | Fan problem Show causes & actionsLikely causes
Engineer action Check the wiring and the fan | Details |
| A06Lockout | No flame after the ignition phase (6 times in 4 minutes) Show causes & actionsLikely causes
Engineer action Check that the electrodes are correctly positioned and if necessary change it Check the burner Check the Offset at the minimum power Check if flue gas circuit is free Check and if necessary change the siphon | Details |
| A41Lockout | Flow sensor disconnected Show causes & actionsLikely causes
Engineer action Check the correct positioning and operation of the flow sensor | Details |
| A42Lockout | Flow sensor fault Show causes & actionsLikely causes
Engineer action Change the sensor | Details |
| F07 | High fume temperature Show causes & actionsThe exchanger probe detects and excessive temperature for over 2 minutes Engineer action Check the exchanger | Details |
| F10 | Flow sensor fault Show causes & actionsLikely causes
Engineer action Check the wiring or change the sensor | Details |
| F11 | Return sensor fault Show causes & actionsLikely causes
Engineer action Check the wiring or change the sensor | Details |
| F12 | DHW sensor fault Show causes & actionsLikely causes
Engineer action Check the wiring or replace the sensor | Details |
| F13 | Exchanger probe fault Show causes & actionsLikely causes
Engineer action Check the wiring or replace the probe | Details |
| F14 | Flow sensor fault Show causes & actionsLikely causes
Engineer action Check the wiring or change the sensor | Details |
| F15 | Fan problem Show causes & actionsLikely causes
Engineer action Check the wiring and the fan Check the fan, clean debris | Details |
| F34 | Supply voltage under 170V Show causes & actionsLikely causes
Engineer action Check the electrical system | Details |
| F35 | Irregular mains frequency Show causes & actionsLikely causes
Engineer action Check the electrical system | Details |
| F37 | Incorrect system water pressure Show causes & actionsLikely causes
Engineer action Fill the system | Details |
| F39 | External probe fault Show causes & actionsLikely causes
Engineer action Check the sensor | Details |
| F43 | Exchanger protection activation. Show causes & actionsLikely causes
Engineer action Check the wiring or change the sensor Check the circulating pump Vent the system | Details |
| F52 | Flow sensor fault Show causes & actionsLikely causes
Engineer action Change the sensor | Details |
| A61Lockout | Controller ABM03A fault Show causes & actionsLikely causes
Engineer action Check the earth connection and replace the controller if necessary. | Details |
| A62Lockout | No communication between controller and gas valve Show causes & actionsLikely causes
Engineer action Connect the controller to the gas valve Replace the valve | Details |
| A63Lockout | Controller ABM03A fault Show causes & actionsLikely causes
Engineer action Check the earth connection and replace the controller if necessary. | Details |
| F66 | Controller ABM03A fault | — |
Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.
Engineer: Check the regular gas flow to the boiler and that the air has been purged from the pipes Check that the electrodes are correctly positioned and free of any deposits Check and change the gas valve Check inlet gas pressure Check and if necessary change the siphon Check the ionising electrode wiring
Triggered by fault code A01.
Engineer: Check the PCB
Triggered by fault code A02.
Engineer: Check the correct positioning and operation of the flow sensor Check pump and radiator valves present in the system Check operation of the internal by-pass
Triggered by fault code A03.
Engineer: Check the flue
Triggered by fault code A04.
Engineer: Check the wiring and the fan
Triggered by fault code A05.
Common questions from engineers and homeowners about the Ferroli MODENA 27 C HE.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 28 June 2026.