Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Isolate DHW valve underneath appliance
(using mains stopcock is also acceptable)
Refit flow switch from previous test if you have not already done so
(using mains stopcock is also acceptable)
Refit flow switch from previous test if you have not already done so
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage from pin 5 at connector
X13 to a suitable earth point.
Is the voltage now approximately 4.8V DC?
Note:
This test can be carried out while appliance is doing self check.
X13 to a suitable earth point.
Is the voltage now approximately 4.8V DC?
Note:
This test can be carried out while appliance is doing self check.
Isolate as per TOPs P4
and refit as necessary