Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
No Demands
Disconnect the Fan Connector from the fan assembly and make safe
Disconnect the Fan Connector from the fan assembly and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Ensure appliance is not in lockout.
Test 1: Measure the Voltage between the Brown and Yellow wires at the PCB connector with it still attached to the PCB
Expect approximately 25 VAC or greater
Test 2: Turn On DHW Tap
Measure the Voltage at the test points as in Test 1 again.
Expect an increase of approximately 2.0 VAC or greater from the original voltage measured in the first test.
Note:
If the appliance locks out the voltage increase will not be present, reset appliance as necessary until test is complete.
Test 1: Measure the Voltage between the Brown and Yellow wires at the PCB connector with it still attached to the PCB
Expect approximately 25 VAC or greater
Test 2: Turn On DHW Tap
Measure the Voltage at the test points as in Test 1 again.
Expect an increase of approximately 2.0 VAC or greater from the original voltage measured in the first test.
Note:
If the appliance locks out the voltage increase will not be present, reset appliance as necessary until test is complete.
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Isolate as per TOPs P4
and refit as necessary