Observation:
Test 1 - Central heating.
Gas Off
CH Demand
Mains Power On
Air heater switch set to timed.
Allow the ignition sequence to commence.
Does the combustion fan run for longer than 30 seconds?
Remove CH demand.
Air heater switch set to Off.
Test 2 - Domestic hot water.
Water heater switch set to timed.
Set thermostat to MID position.
Allow the ignition sequence to commence.
Does the combustion air fan run for longer than 30 seconds?
Note: If the appliance has gone to lockout ensure this is reset before carrying out either test.
Gas Off
CH Demand
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Air heater switch set to timed.
Allow the ignition sequence to commence.
Does the combustion fan run for longer than 30 seconds?
Remove CH demand.
Air heater switch set to Off.
Test 2 - Domestic hot water.
Water heater switch set to timed.
Set thermostat to MID position.
Allow the ignition sequence to commence.
Does the combustion air fan run for longer than 30 seconds?
Note: If the appliance has gone to lockout ensure this is reset before carrying out either test.
Isolate as per TOPs P4
and refit as necessary