Set Appliance State:
Mains Power Off
Selector switch to DHW position
CH temperature selector to minimum
DHW Preheat selector to ON position
Ensure there is a demand for preheat - this can be achieved by running the hot water tap with the gas to the appliance turned OFF
CH temperature selector to minimum
DHW Preheat selector to ON position
Ensure there is a demand for preheat - this can be achieved by running the hot water tap with the gas to the appliance turned OFF
Gas On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
With DHW preheat selector in the 'Preheat ON' position does the boiler fire without a hot tap running?
