Troubleshooting a Check Light
DC Power Supply
Gas Supply
Grounds
Thermocouple
Burner
Reignitor
Electrode
Solenoid
Power Module
Control Panel
Installation of wire
harness
• DC – If DC voltage drops below 9.6VDC – AC ripple
on DC line (Dirty Voltage)
• Gas Supply - see components and discuss
* Grounds- a bad or loose ground can cause a Check
Light! A loose ground can create negative millivolts
☺ Discuss
• If a lower control board has recently been replaced
and the check light comes on at start up – review wiring
diagram of new control board and review installation
instructions – in some cases, a wiring harness needs to
be replaced and a ground wire needs to be removed.
(see next slide for example)
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