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Servicing should only be performed by a Qualified Service Technician
•
Remove and reinsert the circuit board end of the Gas Control Valve connector. Make sure it is connected
tightly and that the pins are clean.
•
Recycle unit again to start another ignition cycle. If you still do not see a brief blue flame through the sight
glass at the moment the Gas Control Valve icon appears on the display, verify that 24 VDC is present on
the connector pins 1 and 5. Use care to not bend or damage the pins while testing.
•
Connect test leads to the Gas Control Valve connector’s pins. Gently connect probes to Gas Control Valve
connector’s two outer pins. Set the meter to DC volts.
•
Recycle unit again to start an ignition cycle.
•
At the moment the Gas Control Valve icon appears on the display, you should see 24 VDC on your meter.
This electrical signal will only last for 2-3 seconds (if the burner does not ignite or the flame sensor does
not detect ignition).
24 VDC PRESENT
•
If 24 VDC is present on the Gas Control Valve connector during the beginning of an ignition cycle, reinstall
the connector and recycle the unit again.
•
Check the gas supply pressure during ignition using test procedure from "Gas Pressure Test" on Page 9.
•
During the ignition cycle, the gas supply pressure should drop about 0.5” to 1.5” W.C. when the Gas Control
Valve icon appears if the Gas Control Valve is working. If the gas supply pressure does not drop at the
beginning of the ignition cycle, the Gas Control Valve may be defective—contact Commercial Technical
Support. A pressure drop of more than 1.5” W.C indicates an issue with the gas supply (pipe too long or
too small, bad regulator, etc.).
24 VDC NOT DETECTED
•
If 24 VDC is not detected on the connector terminals when the Gas Control Valve icon appears on the
display, contact Commercial Technical Support.
