Set Appliance State:
Mains Power Off
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Set DHW flow rate at tap to approximately 5 l/min
and allow DHW to run cold
and allow DHW to run cold
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to ignite.
Monitor the voltage across the terminals of the modulating solenoid (blue wires).
Does the voltage reduce as the DHW temperature demand is met?
Monitor the voltage across the terminals of the modulating solenoid (blue wires).
Does the voltage reduce as the DHW temperature demand is met?
