Sterling GF-400, TF-400, TF-150 Tubular Propeller Troubleshooting Guide, Symptoms, Possible Causes

Table 6 - Tubular Propeller Troubleshooting Guide

SYMPTOMS	POSSIBLE CAUSE(S)	CORRECTIVE ACTION
A. Flame pops back.	1. Burner orifice too small.	1. Check with local gas supplier for proper orifice
		size and replace. Refer to “Operation”.
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 main burners.	1. Clean main burner ports.
tipping on LP gas is permissible).	2. Misaligned orifices.	2. Replace manifold assembly.
	3. Insufficient combustion air.	3. Insufficient combustion air.
	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	4. Determine cause and repair accordingly.
	or draft hood.
E. Gas odor.	1. Shut off gas supply immediately!	1. Inspect all gas piping and repair.
	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. Pressure regulator set too low.	4. Test and reset manifold pressure refer to
		“Operations”.
	5. Main burner orifices dirty.	5. Clean or replace orifices.
	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;
		check for 24V at gas valve terminals during
		trial for ignition period if present and valve
		does not open. Replace valve.
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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