| Fault Code / Fault Image | System Behaviour |
|---|
| 1 |
Flame lockout after several ignition attempts |
| 2 |
False flame |
| 3 |
High water temperature limit |
| 5 |
No tacho from fan |
| 8 |
Flame circuit error |
| 9 |
Valve driver circuit error |
| 11 |
Flow/return sensor calibration error |
| 12 |
Default lockout |
| 13 |
Elapsed the number of retrials |
| 21 |
ADC error |
| 26 |
Flame signal lost 5 times in 4 minutes |
| 31 |
Centra heating supply sensor error (open or short) |
| 44 |
Central heating rerturn sensor error (open or short) |
| 7 |
High flue gas tempurature |
| 25 |
CRC error |
| 30 |
Boiler flow temprature sensor short circuit |
| 31 |
Boiler flow temperature sensor open ciruit |
| 32 |
Domestic hot water temperature sensor short circuit |
| 33 |
Domestic hot water temperature sensor open circuit |
| 34 |
Low mains supply voltage |
| 37 |
Low system water pressure |
| 40 |
High system water pressure |
| 41 |
No water pressure signal recievced fom MMI |
| 45 |
Flue gas temperature sensor short circuit |
| 46 |
Flue gas temperature sensor open circut |
| 47 |
Water pressure sensor open circuit |
| 99 |
Communication MMI -ESYS lost |
| E01 |
Ignition lockout |
| E02 |
False flame lockout |
| E03 |
Overheat lockout |
| E05 |
Fan fault |
| E08 |
Flame circuit failure |
| E09 |
Valve feed back error |
| E12 |
EEPROM lockout |
| E15 |
Sensor drift lockout |
| E16, E17, E18 |
Sensor stuck lockout |
| E21 |
ADC lockout |
| E33 |
Return thermistor fault |
| E34 |
Low power supply lockout |
| E35 |
Flow thermistor fault |
| F07 |
Exhaust sensor fault |
| F13 |
Remote reset lockout |
| F37 |
Low water pressure |
| F40 |
Water pressure too high |
| F47 |
Water pressure sensor not connected |
| F52 |
Domestic hot water (DHW) sensor fault |
| F53 |
Flue temperature sensor lockout |
