Sterling GG-105, GG-90, GG-75 Tubular Propeller Troubleshooting Guide, Symptoms, Possible Causes

Table 9 - Tubular Propeller Troubleshooting Guide

SYMPTOMS	POSSIBLE CAUSE(S)	CORRECTIVE ACTION
A. Flame pops back.	1. Burner orifice incorrect.	1. Check for proper orifice size. Refer to “Operation”.
	2. Low manifold Pressure.	2. Test and reset manifold pressure.
B. Noisy Flame.	1. Irregular orifice causing whistle or resonance.	1. Replace orifice.
	2. Excessive gas input.	2. Test and reset manifold pressure.
C. Yellow tip flame (some yellow	1. Clogged burner.	1. Clean main burner ports.
tipping on LP gas is permissible).	2. Misaligned orifice.	2. Align manifold assembly.
	3. Insufficient combustion air.	3. Clean combustion air inlet openings.
	4. Possibly over fired.	4. Check gas input and manifold pressures.
D. Floating flame.	1. Blocked venting.	1. Clean Flue. Refer to “Installation”.
	2. Insufficient combustion air.	2. Clean combustion air inlet openings.
	3. Blocked heat exchanger.	3. Clean heat exchanger. Refer to “Installation”.
	4. Air leak into combustion chamber, flue	4. Determine cause and repair accordingly.
	collector or draft hood.
E. Gas odor.	1. Gas pipe leak.	1. Inspect all gas piping and repair.
Shut off gas supply immediately!	2. Leaking gas test port on valve.	2. Check to ensure gas test ports are seated.
	3. Blocked heat exchanger.	3. Clean heat exchanger/flue.
	4. Blocked draft hood.	4. Clean flue collector.
	5. Negative pressure in the building.	5. See “Installation”.
F. Delayed ignition.	1. Improper ground.	1. Check grounding wires and spark bracket
		connections.
	2. Bad or broken spark cable.	2. Inspect spark cable connections and cuts.
	3. Faulty control.	3. Check to ensure spark is energized after
		pre purge period.
	4. Manifold pressure set too low.	4. Test and reset manifold pressure refer to
		“Operations”.
	5. Main burner orifice dirty.	5. Clean or replace orifice.
	6. Improper venting.	6. Refer to “Installation”.
G. Failure to ignite.	1. Gas supply is off.	1. Open all manual valves “check for leaks”.
	2. No power supply to unit.	2. Turn on power supply, check fuses and
		replace if bad.
	3. Thermostat not calling.	3. Turn up thermostat, Check for 24v on
		terminals R and W1 on terminal strip.
	4. Defective high limit.	4. Check switch for continuity if open with no
		heat present, replace.
	5. Defective drafter prove switch.	5. Check switch operation to ensure
		switch closes after draftor purge period.
		If it does not make/check tubing
		connections/blockage.
	6. Loose wiring.	6. Check all wiring per diagram.
	7. Improper ground.	7. Check all ground wires and connections.
	8. Improper thermostat or transformer wiring.	8. Check both, for wiring according to diagram.
	9. Ignitor defective/damaged.	9. Replace ignitor.
	10. Misaligned ignitor.	10. Resecure ignitor bracket.
	11. Defective gas valve.	11. Check for 24V at gas valve terminals during
		trial for ignition period. If present with no
		manifold pressure. Replace valve.
	12. Blown fuse.	12. Refer to symptom “Q”.
H. Condensation.	1. Improper venting.	1. Refer to “Installation, Venting”.
	2. Unit under fired.	2. Check gas supply pressures to unit. Refer
		to “Installation”.
	3. Building too cold.	3. Refer to “Installation”.

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