Monessen Hearth 624DV(ST, PF, CR troubleshooting, Standing Pilot Ignition, Symptom, Possible Cause

troubleshooting			Designer Series Gas Fireplaces
Standing Pilot Ignition
SYMPTOM		POSSIBLE CAUSE	ACTION
1.	Spark ignitor will	A. Wire disconnected.	A. Open door and check to make sure wire is connected
	not light pilot after		to ignitor.
	repeated triggering of	B. Defective ignitor.	B. Check for spark at electrode and pilot. If no spark and
	piezo.		electrode wire is properly connected, replace pilot
			assembly.
		C. No gas or low gas pres-	C. Check remote/manual shut off valve from fireplace.
		sure.	Low pressure can be caused by bent lines, restricted
			lines, low pressure line pressure. Consult with plumber
			or gas supplier.
		D. No Propane/LPG in tank	D. Check Propane/LPG tank. Refill tank.
2. Pilot will not stay lit		A. Defective thermocouple	A. Check that thermocouple flame impinges on thermo-
	after carefully follow-		couple. Clean and/or adjust pilot for maximum flame
	ing lighting instruc-		impingement. Ensure that the thermocouple connec-
	tions.		tion at the gas valve is fully inserted and tight.
			Disconnect the thermocouple from the valve, place
			one millivolt lead wire on the tip of the thermocouple
			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 15 mV, replace pilot
			assembly.
		B. Defective valve	B. If thermocouple is producing more than 15 mV,
			replace faulty valve.
3.	Pilot burning, valve	A. Defective switch, wall	A. Check switch and wire for proper connection. Place
	knob turned to “ON”,	switch, remote control or	jumper wires across terminals of switch. If burner
	switch is turned to	wire	comes on, replace defective switch.If the switch is OK,
	“ON” or “RS”, but		repeat the same procedure on remote control If burner
	burner will not ignite.		comes on, replace remote control.
			Place jumper wire across wire at gas valves (terminals
			marked TH and TP/TH). If burner comes on, wires are
			faulty or connections are bad. Replace wire.
		B. Pilot flame too small	B. If pilot flame is not close enough to the thermopile,
			adjust pilot flame.
		C. Defective or malfunction-	C. Check thermopile wire connections to make sure
		ing thermopile	all are tight and that the thermopile is fully inserted
			into pilot assembly. Check thermopile with a millivolt
			meter. Connect leads to TP and TP/TH terminals on
			the control valve. If meter reading is below 325 mV,
			replace pilot assembly.
		D. Defective valve	D. Turn valve knob to “On” and switch to “ON.” Take a

reading at the thermopile leads (TP & TP/TH) on the valve. If the meter reads greater than 175 mV and the burner does not light, replace defective valve.

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