Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Boiler CH thermostat to MAX
Attach temperature probes as indicted by the red arrows
(PCB housing may need to be removed from holder to gain access)
Attach temperature probes as indicted by the red arrows
(PCB housing may need to be removed from holder to gain access)
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Measure the temperature differential across the primary heat exchanger at the time the noise occurs.
Expected differential approximately 22°C or less.
Note:
1. The differential may exceed 22°C when the heating first fires due to the system being cold, this is normal.
2. To reduce the time taken for this test some radiators can be turned off temporarily.
Expected differential approximately 22°C or less.
Note:
1. The differential may exceed 22°C when the heating first fires due to the system being cold, this is normal.
2. To reduce the time taken for this test some radiators can be turned off temporarily.
