Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
Disconnect electrical connector from the fan
assembly, position in a safe place
Ensure No Demands
Preheat switched OFF (ECO button illuminated)
assembly, position in a safe place
Ensure No Demands
Preheat switched OFF (ECO button illuminated)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Click here for more information before carrying out this test.
Ensure appliance is not in lockout, reset appliance as required and no demands are present, pump not running (if pump is running restart test at SET APPLIANCE STATE).
Test 1: Measure for AC Voltage across terminals 2 (Brown) and 4 (Yellow) of connector ST5 with it still attached to the PCB and note the reading.
Test 2: Turn On DHW Tap
Measure for AC Voltage at the test points as in Test 1 again.
Expect an increase in voltage of approximately 1.0 VAC or greater from the original voltage measured on the first test.
Note: If the appliance locks out the voltage increase will not be present, reset appliance as necessary until test is complete.
Ensure appliance is not in lockout, reset appliance as required and no demands are present, pump not running (if pump is running restart test at SET APPLIANCE STATE).
Test 1: Measure for AC Voltage across terminals 2 (Brown) and 4 (Yellow) of connector ST5 with it still attached to the PCB and note the reading.
Test 2: Turn On DHW Tap
Measure for AC Voltage at the test points as in Test 1 again.
Expect an increase in voltage of approximately 1.0 VAC or greater from the original voltage measured on 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