Set Appliance State:
Mains Power Off
Set Multimeter to DC Volts 
Turn Hot Water Tap On
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to ignite and establish.
Measure for DC voltage across the gas valve modulation coil.
Expected voltage approximately 10 Vdc.
Note:
1. Voltage measured could be either negative or positive, ensure a good connection is made.
2. Ensure a sufficient DHW flow rate to prevent boiler from modulating the burner pressure.
Measure for DC voltage across the gas valve modulation coil.
Expected voltage approximately 10 Vdc.
Note:
1. Voltage measured could be either negative or positive, ensure a good connection is made.
2. Ensure a sufficient DHW flow rate to prevent boiler from modulating the burner pressure.
