Hearth and Home Technologies SL-550TR-D Troubleshooting, Standing Pilot Ignition System

14 Troubleshooting

With proper installation, operation, and maintenance your gas appliance will provide years of trouble-free service. If you do experience a problem, this troubleshooting guide will assist a qualified service person in the diagnosis of a problem and the corrective action to be taken. This troubleshooting guide can only be used by a qualified service technician.

A. Standing Pilot Ignition System

Symptom	Possible Causes	Corrective Action
1. After repeated triggering	a. Defective ignitor.	Check the spark at the electrode and pilot. If no spark and electrode
of the red or black piezo		wire is properly connected, replace the ignitor.
ignitor button, the spark
	b. Defective pilot or misaligned	Using match, light the pilot. If the pilot lights, turn off the pilot and
ignitor will not light the pilot.
	electrode (spark at electrode).	trigger the red piezo ignitor button again. If the pilot lights, an im-
		proper gas/air mixture caused the bad lighting and a longer purge
		period is recommended. If the pilot will not light, ensure the the gap
		at the electrode and pilot is one-eighth (1/8) inch to have a strong
		spark. If the gap is OK, replace the pilot.
	c. No gas or low gas pressure.	Check the remote shut-off valves from the fireplace. Usually, there
		is a valve near the gas main. There can be more than one (1) valve
		between the fireplace and the main.
	d. No LP in tank.	Check the LP (propane) tank. You may be out of fuel.
2. The pilot will not stay lit	a. Defective thermocouple.	Check that the pilot flame impinges on the thermocouple. Clean
after carefully following the		and/or adjust the pilot for maximum flame impingement.
lighting instructions.		Ensure that the thermocouple connection at the gas valve is fully
		inserted and tight (hand tighten plus 1/4 turn).
		Disconnect the thermocouple from the valve, place one millivolt
		meter lead wire on the tip of the thermcouple and the other meter
		lead wire on the thermocouple copper lead. Start the pilot and hold
		the valve knob in. If the millivolt reading is less than 15mV, replace
		the thermocouple.
	b. Defective valve.	If the thermocouple is producing more than 15 millivolts, replace
		faulty valve.
3. The pilot is burning,	a. ON/OFF switch or wires	Check the ON/OFF switch and wires for proper connections. Place
there is no burner flame ,	defective.	the jumper wires across the terminals at the switch. If the burner
the valve knob is in the ON		comes on, replace the defective switch. If the switch is OK, place the
position, and the ON/OFF		jumper wires across the switch wires at the gas valve. If the burner
switch is in the ON position.		comes on, the wires are faulty or connections are bad.
	b. Thermopile may not be gener-	If the pilot flame is not close enough physically to the thermopile,
	ating sufficient millivoltage.	adjust the pilot flame.
		Be sure the wire connections from the thermopile at the gas valve
		terminals are tight and that the thermopile is fully inserted into the
		pilot bracket.
		Check the thermopile with a millvolt meter. Take the reading at
		TH-TP&TP terminals of the gas valve. The meter should read 325
		millivolts minimum, while holding the valve knob depressed in the
		pilot position, with the pilot lit, and the ON/OFF switch in the OFF
		position. Replace the faulty thermopile if the reading is below the
		specified minimum.
		With the pilot in the ON position, disconnect the thermopile leads
		from the valve. Take a reading at the thermopile leads. The read-
		ing should be 325 millivolts minimum. Replace the thermopile if the
		reading is below the minimum.

Heat & Glo • SL-550 / 750 / 950TR-D • InD • 2044-985 Rev. M • 10/06 53