Set Appliance State:
Ensure secondary heat exchanger is cool and there is a
demand for Preheat - this can be done by running the hot
water with the gas turned off
Hot Water Tap Off
demand for Preheat - this can be done by running the hot
water with the gas turned off
Hot Water Tap Off
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Allow preheat to run and complete pre heat cycle and return
to standby mode. Is the preheat satisfactory?
Note:From cold, preheat cycle will take approximately 90 seconds to complete cycle but this will depend on the starting temperature. The colder the start temperature the longer the cycle.
If boiler is warm then a 't' will display if boiler is cold then a 'd' may display in this instance both are correct.
Click here if H3 fault displays during preheat operation
to standby mode. Is the preheat satisfactory?
Note:From cold, preheat cycle will take approximately 90 seconds to complete cycle but this will depend on the starting temperature. The colder the start temperature the longer the cycle.
If boiler is warm then a 't' will display if boiler is cold then a 'd' may display in this instance both are correct.
Click here if H3 fault displays during preheat operation
