Set Appliance State:
Use Insulation Mat as required
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Selector switch to Water
Adjust flow rate at tap to approximately 7 l/min
Gain access to PCB
Selector switch to Water
Adjust flow rate at tap to approximately 7 l/min
Gain access to PCB
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to ignite and heat DHW to approximately 55°C.
Measure the voltage between connections 1 and 3 (two yellow wires) on connector X16 on sequence PCB.
Does the voltage reduce as the DHW is met?
Measure the voltage between connections 1 and 3 (two yellow wires) on connector X16 on sequence PCB.
Does the voltage reduce as the DHW is met?
