Troubleshooting 93
Failure mode
Cause
Check method
Ignition failure
Main gas valve
1. Check the primary/secondary power supply to the main gas valve.
●
Check, with a multi-meter, between the RED-YELLOW and WHITE-RED wires to
verify that the input power is DC 22-24V
2. Replace the PCB if power is not supplied.
3. If power supply is normal, check if the coil is open.
●
Check the resistance. (refer to page 18)
4. Check if the solenoid valve works properly.
●
Feel or hear a click.
PIN No.
1
2
3
4
Check if the coil is open (Proper resistance range : 100-1,000 Ω)
Check the voltage of the solenoid valve / White-Yellow, White-Red
