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Heatline Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- F00 The F00 code appears when your Heatline boiler's control board (PCB) cannot receive a valid temperature reading from… Read more →
- F01 When your Heatline boiler displays F01, it has detected a problem with the return heating temperature sensor — also… Read more →
- F10 The F10 code appears on Heatline boilers when the control board detects a problem with the flow heating temperature… Read more →
- F11 The F11 code on a Heatline boiler indicates that the control board has detected a problem with the return heating… Read more →
- F20 The F20 code on a Heatline boiler means the unit has overheated and the internal safety thermal cut-out has triggered.… Read more →
- F22 The F22 code appears when your Heatline boiler detects that the water pressure inside the sealed heating system has… Read more →
- F23 The F23 fault code on Heatline boilers indicates that the temperature difference between the flow pipe (water leaving… Read more →
- F24 The F24 code appears when the boiler's PCB detects that water temperature is climbing too rapidly — a clear sign that… Read more →
- F26 The F26 code on a Heatline boiler indicates a fault with the stepper motor that controls the gas valve. This small but… Read more →
- F27 The F27 fault code appears when the boiler's flame supervision system detects an anomaly with the burner flame —… Read more →
- F28 The F28 code on a Heatline boiler signals an ignition lockout. After three unsuccessful attempts to establish a stable… Read more →
- F29 The F29 code appears on Heatline boilers when the appliance cannot establish or maintain a stable flame during an… Read more →
- F32 The F32 fault code on Heatline boilers (including the Capriz range) signals that the boiler's control board has… Read more →
- F49 The F49 code on a Heatline boiler signals a problem with the eBUS — the low-voltage communication circuit that allows… Read more →
- F61 The F61 code appears when your Heatline boiler's control board detects a problem in the gas valve circuit. The PCB… Read more →
- F62 The F62 fault code on Heatline boilers signals that a delayed flame switch-off has been detected. In plain terms, the… Read more →
- F63 The F63 code on a Heatline boiler points to an EEPROM fault on the main printed circuit board (PCB). The EEPROM is a… Read more →
- F64 The F64 code on a Heatline boiler indicates that the control board has detected a short circuit or an unexpected… Read more →
- F65 The F65 code on a Heatline boiler indicates that the main PCB (printed circuit board) has detected an overheating… Read more →
- F67 The F67 code on a Heatline boiler indicates that the boiler's control board has detected an abnormal or absent flame… Read more →
- F68 The F68 code appears on Heatline boilers when the PCB detects an unstable or erratic flame signal from the ionisation… Read more →
- F70 The F70 code on a Heatline boiler indicates that the boiler's main control board (PCB) has not been correctly… Read more →
- F71 The F71 code on Heatline boilers indicates a fault with the flow heating temperature sensor (NTC thermistor).… Read more →
- F72 The F72 fault code on Heatline boilers (including the Capriz and Capriz Plus) indicates that the boiler's control board… Read more →
- F73 The F73 code appears on Heatline boilers when the heating circuit water pressure sensor is sending a signal that falls… Read more →
- F74 The F74 fault code on a Heatline boiler indicates that the PCB has detected an out-of-range signal from the heating… Read more →
- F76 The F76 code appears when the thermal fuse mounted on the primary heat exchanger has physically tripped due to… Read more →
- F77 The F77 fault code on a Heatline boiler indicates that the boiler has detected a problem with its condensate removal… Read more →
- F83 The F83 fault code appears when the boiler fires up but the flow and return NTC thermistors (temperature sensors) fail… Read more →
- F84 The F84 fault code on a Heatline boiler indicates that the control board has detected an implausible difference between… Read more →
- F85 The F85 fault code appears on Heatline boilers when the control board detects an implausible temperature reading from… Read more →
- F86 The F86 code on a Heatline boiler signals a problem with the underfloor heating (UFH) safety interlock contact.… Read more →