Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Gain access to PCB (use Insulation Mat as required)
Selector switch set to CH/DHW
CH temperature control set to MAX
Preheat switched OFF
Note.
Slightly move connectors until PCB connection strips
are exposed for voltage measurement
Selector switch set to CH/DHW
CH temperature control set to MAX
Preheat switched OFF
Note.
Slightly move connectors until PCB connection strips
are exposed for voltage measurement
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Step 1. Run a hot tap (DHW demand) for approx. 10 seconds then close tap.
Step 2. Place a CH demand on appliance.
Measure for AC voltage across pin 3 (X2 connector PCB) and
main neutral (terminal block).
Expected voltage approximately 230 Vac
Note. It may take several attempts to confirm voltage, as it is only present for approx. 5 seconds, repeat steps 1 & 2 until test is complete.
Step 2. Place a CH demand on appliance.
Measure for AC voltage across pin 3 (X2 connector PCB) and
main neutral (terminal block).
Expected voltage approximately 230 Vac
Note. It may take several attempts to confirm voltage, as it is only present for approx. 5 seconds, repeat steps 1 & 2 until test is complete.
Isolate as per TOPs P4
and refit as necessary