Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
CH temperature control set to MAX
Remove flue gas test point
Insert temperature probe into flue gas test point
Remove flue gas test point
Insert temperature probe into flue gas test point
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Allow the appliance to ignite and run for central heating.
Observe the flue temperature.
At what flue temperature does fault code A75 / A79 occur?
Note.
1. To speed up this test, reduce the heating circuit by turning off some radiators.
2. If a fault code other than A75 / A79 appears CLICK HERE.
3. When the flue gas test cap is refitted, the integrity of the seal should be checked.
BOILER OPERATES CORRECTLY - FLUE TEMP BELOW 90°C - NO FAULT CODE APPEARS CLICK HERE
BOILER GOES TO FLUE OVERHEAT - TEMPERATURE BELOW 90°C CLICK HERE
FLUE TEMPERATURE EXCEEDS 90°C CLICK HERE
Observe the flue temperature.
At what flue temperature does fault code A75 / A79 occur?
Note.
1. To speed up this test, reduce the heating circuit by turning off some radiators.
2. If a fault code other than A75 / A79 appears CLICK HERE.
3. When the flue gas test cap is refitted, the integrity of the seal should be checked.
BOILER OPERATES CORRECTLY - FLUE TEMP BELOW 90°C - NO FAULT CODE APPEARS CLICK HERE
BOILER GOES TO FLUE OVERHEAT - TEMPERATURE BELOW 90°C CLICK HERE
FLUE TEMPERATURE EXCEEDS 90°C CLICK HERE
