Direct Gas Make-Up Air
55
Troubleshooting
Direct Gas-Fired Heat
Electrical continuity from control center
end of flame wire to flame rod boot?
Yes
No
Flame wire broken.
Replace wire.
Connection at flame rod boot failed.
Repair connection.
Flame rod boot corroded
. Replace flame rod boot.
Electrical continuity from flame wire to
ground?
No
Yes
Shield or spare wire touching flame wire in flame rod boot.
Cut shield or spare wire back to eliminate contact.
Burr from flame rod threads touching flame rod
. Remove burr.
Flame rod or flame rod porcelain
cracked or deteriorated?
No
Yes
Replace flame rod.
1.0 micro amps or higher on terminals
FC '+' and '-' on flame safeguard amp?
Yes
No
Pilot pressure too low
. Increase pilot pressure.
Check wiring to flame safeguard.
Correct any wiring Issues.
Flame safeguard (FSG) or flame safeguard amplifier faulty.
Replace flame safeguard.
With a flame signal of 1.0 micro amps or higher, the green flame light should be illuminated and steady.
24 VAC between terminals 37
and 21?
Yes
No
Check wiring to flame safeguard.
Correct any wiring issues.
Flame safeguard (FSG) faulty
. Replace flame safeguard.
Gas pressure at outlet of the first
solenoid valve?
Yes
No
Inlet gas pressure too high.
Reduce inlet gas pressure to below the
maximum gas pressure.
Solenoid valve stuck shut
. Tap valve gently to loosen.
Solenoid failed.
Replace solenoid or valve assembly.
Main burner flame lit?
Yes
No
Low fire set too low.
Adjust low fire as described in the burner
startup section.
Everything is working properly, consult factory.
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