Sterling RF-60, RF-90, RF-75, RF-45, RF-30 specifications Check for continuous 115v on terminal

Table 7 - Tubular Propeller Troubleshooting Guide

SYMPTOMS		POSSIBLE CAUSE(S)		CORRECTIVE ACTION
Q. Cold air is delivered during	1. Incorrect manifold pressure or input.		1.	Refer to “Operation”.
heater operation.	2. Air throughput too high.		2.	Refer to “Operation”.
R. High limit tripping.	1. Unit is over fired.		1.	Burner orifices may be too large, verify
				and replace.
	2.	Air flow is low.	2.	Check for proper voltage, ensure fan
				blade is correct.
	3.	Defective switch.	3.	Check operation of switch, did the switch
				open when unit is running or is the switch
				open during start-up.
	4.	Defective control board.	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.
S. Power ventor will not run.	1. Loose wiring or connections.		1.	Check all wring in the power vent circuit to
				ensure good connection, including “Neutral”.
	2.	Motor overload is tripped or bad motor.	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.
T. Power ventor turns on and off	1. Power ventor improperly wired.		1.	Check power ventor 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.
U. Power ventor will not stop.	1. Power ventor improperly wired.		1.	Check power ventor 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
				for heat, replace control board.

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