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Johnson & Starley Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- 1 Fault Code 1 on Johnson & Starley boilers indicates that the boiler has attempted to light the burner and failed to… Read more →
- 12 Code 12 on a Johnson & Starley warm-air unit is the default lockout — the controller has shut the appliance down for a… Read more →
- 13 Fault code 13 (shown as E13 on the display) is a safety lockout that appears across several Johnson & Starley ranges —… Read more →
- 2 Fault Code 2 (shown as 'Display 2' on the LCD/LED panel) appears on Johnson & Starley Economaire warm air heaters when… Read more →
- 21 Fault code 21 on Johnson & Starley warm air units points to a problem with the Air Circulation Fan (ACF) — the fan… Read more →
- 25 Fault code 25 on Johnson & Starley WarmCair condensing warm air heaters (C Series and DW Series) indicates that the… Read more →
- 26 Fault code 26 on Johnson & Starley WarmCair warm air heaters is a collective safety lockout code displayed as 'E26' on… Read more →
- 3 Fault Code 3 on a Johnson & Starley warm air unit signals that the Air Pressure Switch (APS) has not detected the… Read more →
- 30 If your Johnson & Starley 30-series boiler (such as the WarmCair, Reno HE30C, QuanTec 30C, or RenoXtra 30C) has shut… Read more →
- 31 Fault code 31, displayed as E31 on Johnson & Starley boilers (including the Reno HE range and WarmCair warm air units),… Read more →
- 34 Fault code 34 on a Johnson & Starley warm air unit indicates that the boiler's control electronics have detected an… Read more →
- 43 Code 43 on a Johnson & Starley warm-air unit points to a short circuit on the return air temperature sensor — the probe… Read more →
- 44 Code 44 on a Johnson & Starley unit indicates a central-heating return sensor error — the return-side temperature probe… Read more →
- 45 Fault Code 45 appears on Johnson & Starley WarmCair warm air boilers when the control system detects a short circuit in… Read more →
- 46 Fault code 46 on Johnson & Starley WarmCair warm air heaters indicates that the control board has detected an open… Read more →
- 5 Fault Code 5 on Johnson & Starley appliances — displayed as 'E5' on WarmCair warm air heaters and related models such… Read more →
- 57 Fault code 57 on Johnson & Starley Warmcair warm air boilers indicates that the control system has detected the return… Read more →
- 7 Fault code 7 on Johnson & Starley warm air heaters (Economaire and WarmCair ranges) indicates a problem with the gas… Read more →
- 8 Fault code 8 on Johnson & Starley Economaire warm air heaters points to one of two related problems detected by the… Read more →
- 9 Fault code 9 appears on the red LED display visible through the small viewing hole on the front panel of Johnson &… Read more →
- 99 Fault code 99 on Johnson & Starley warm air boilers indicates that the MMI (Man Machine Interface — the control panel… Read more →
- E01 The E01 code appears on Johnson & Starley boilers when the burner has failed to establish a flame after three… Read more →
- E02 E02 on a Johnson & Starley unit is a false flame lockout: the flame-supervision circuit reported a flame at a moment… Read more →
- E03 E03 on a Johnson & Starley unit is the overheat lockout: a temperature inside the appliance exceeded its safety limit… Read more →
- E05 The E05 code appears on Johnson & Starley boilers — including the Quantec, Reno HE, and WarmCair ranges — when the PCB… Read more →
- E08 E08 on a Johnson & Starley unit reports a flame circuit failure: the electronics that detect and supervise the burner… Read more →
- E09 E09 on a Johnson & Starley unit is a valve feedback error: the control board monitors the gas valve's electrical… Read more →
- E12 E12 on a Johnson & Starley unit is an EEPROM lockout: the control board's non-volatile memory — where it stores its… Read more →
- E15 E15 on a Johnson & Starley unit is a sensor drift lockout: one of the temperature sensors the controller cross-checks… Read more →
- E16 E16 on a Johnson & Starley unit is a sensor stuck lockout: a monitored temperature sensor's reading has stopped moving… Read more →
- E17 E17 on a Johnson & Starley unit is a sensor stuck lockout on the second of the monitored sensor channels: a temperature… Read more →
- E18 E18 on a Johnson & Starley unit is the third of the stuck-sensor lockouts: a supervised temperature channel has frozen… Read more →
- E21 E21 on a Johnson & Starley unit is an ADC lockout: the analogue-to-digital converter — the circuit on the control board… Read more →
- E33 E33 on a Johnson & Starley unit reports a return thermistor fault: the sensor measuring return temperature — return air… Read more →
- E34 E34 on a Johnson & Starley unit is a low power supply lockout: the mains voltage reaching the appliance has dropped… Read more →
- E35 E35 on a Johnson & Starley unit reports a flow thermistor fault: the sensor measuring the flow-side temperature — the… Read more →
- F07 F07 on a Johnson & Starley unit reports an exhaust sensor fault: the temperature probe monitoring the flue gases has… Read more →
- F13 F13 on a Johnson & Starley unit is a remote reset lockout: the appliance has locked out after too many reset attempts —… Read more →
- F37 F37 on a Johnson & Starley unit signals low water pressure in the sealed heating circuit — it applies to the models… Read more →
- F40 F40 on a Johnson & Starley unit reports the opposite problem to F37: the sealed heating circuit's pressure is too high… Read more →
- F47 F47 on a Johnson & Starley unit means the water pressure sensor is not connected — the control board can see no signal… Read more →
- F52 F52 on a Johnson & Starley unit reports a domestic hot water sensor fault: the temperature probe on the hot-water side… Read more →
- F53 F53 on a Johnson & Starley unit is a flue temperature sensor lockout: the probe monitoring flue-gas temperature has… Read more →