VOLTAGE PCB TO GAS VALVE

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to DC Volts

Remove ignition PCB from gas valve, place under fan assembly so gas valve connection is facing the front of boiler
Multimeter probe required for this test is the thin long spike
Note: Do not push probe fully into PCB connector

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure

Mains Power On

Measurement:

Test 1. With no demand present measure for DC voltage across terminal 2 (ignition PCB) and terminal 2 (blue) main terminal block.
Expected voltage approximately 133 - 137 Vdc.
Apply DHW demand, 7 seconds after fan has started the voltage should reduce to approximately 118 Vdc.
Test 2. With no demand present measure for DC voltage across terminal 5 (ignition PCB) and terminal 2 (blue) main terminal block.
Expected voltage approximately 133 - 137 Vdc.
Apply DHW demand, 7 seconds after fan has started the voltage
should reduce to approximately 127 Vdc.

Note.
1. It may take several attempts to confirm voltage change, as it is only present for approx 3 seconds, repeat test until complete.
2. Appliance may enter lockout during tests, reset as required until test is complete ( E09 reset button, E13 mains reset).