Set Appliance State:
Mains Power Off
Set Multimeter to DC Volts 
Turn Hot Water Tap On
On/Off Switch in ON position
Mode Selector Switch to Summer
DHW Thermostat to MIN
Flow rate approx 3 litres/min
Mode Selector Switch to Summer
DHW Thermostat to MIN
Flow rate approx 3 litres/min
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Monitor DC Voltage across connections P1 and 2 on the DHW Thermostat. Voltage measured will be greater than 13V DC initially.
When boiler reaches temperature does the voltage measured fall to 0V DC?
When boiler reaches temperature does the voltage measured fall to 0V DC?
