Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
Remove connector CN10 from the PCB and make safe
Ensure no demands
Remove connector CN10 from the PCB and make safe
Ensure no demands
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Cancel purge cycle & If required, reset boiler. (see note 1.)
Measure for DC voltage across pin 3 at CN10 to
a suitable earth connection. (see note 2.)
Voltage should be approximately 15V - 19V DC.
Note.
1. Fan will be running during test due to signal control connector being disconnected.
2. Boiler may enter lockout during test, reset boiler as required until test complete
Measure for DC voltage across pin 3 at CN10 to
a suitable earth connection. (see note 2.)
Voltage should be approximately 15V - 19V DC.
Note.
1. Fan will be running during test due to signal control connector being disconnected.
2. Boiler may enter lockout during test, reset boiler as required until test complete
Isolate as per TOPs P4
and refit as necessary