Sterling GG-75, GG-90, GG-60, GG-45, GG-120, GG-30, GG-105 Check operation of switch, did the switch

Table 9 - Tubular Propeller Troubleshooting Guide

SYMPTOMS	POSSIBLE CAUSE(S)	CORRECTIVE ACTION
R. Cold air is delivered during	1. Incorrect manifold pressure or input.	1. Refer to “Operation”.
heater operation.
S. High limit tripping.	1. Unit is over fired.	1. Burner orifice may be too large, verify
		and replace.
	2. Air flow is low.	2. Check for proper voltage, ensure fan
	3. Defective switch.	blade is correctly positioned 1/3 inside venturi.
		3. Check operation of switch, did the switch
		open when unit is running or is the switch
	4. Defective control board.	open during start-up.
		4. Check for 24v on line side of the high limit.
		Constant voltage should be recorded if not
		control board is suspect. Check flash code.
T. Power venter will not run.	1. Loose wiring or connections.	1. Check all wring in the power vent circuit to
	2. Motor overload is tripped or bad motor.	ensure good connection, including “Neutral”.
		2. Check for 115v between motor leads and
	3. Bad control board.	check amp draw of motor. Replace if needed.
		3. Check for continuous 115v on terminal
		“CBM Blower” and neutral during call for
		heat. If not present and all checks are
		normal, replace.
U. Power venter turns on and off	1. Power venter improperly wired.	1. Check power venter circuit per wiring
during operation.	2. Motor overload cycling or defective motor.	diagram.
		2. Check motor voltage and amp draw to motor
	3. Defective control board.	name plate, replace if motor found defective.
		3. Check for continuous 115v on terminal
		“CMB Blower” during call for heat, replace
		board if found defective.
V. Power venter will not stop.	1. Power venter improperly wired.	1. Check power venter circuit per wiring
	2. Main burner did not light on call for heat.	diagram.
		2. Heater is in lockout mode check flash code
	3. Defective control board.	table for problem.
		3. No flash codes present along with no call
	4. Loss of pressure. Pressure switch not	for heat, replace control board.
		4. Check venting for blockage. Check tubing for
	made.	blockage or hole. Check spud for blockage.

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