Hearth and Home Technologies CD4842MILR, CD4842MR Symptom Possible Cause Corrective Action

A. Standing Pilot Ignition System (continued)

Symptom	Possible Cause	Corrective Action
3. (Continued)	C. Failed valve.	Turn the valve knob to the ON position. Place the ON/OFF switch
		in the ON position. Check the millivolt meter a the thermopile
		terminals. The millivolt meter should read greater than 125mV. If the
		reading is acceptable, and if the burner does not come on, replace
		the gas valve.
	D. Plugged burner orifice.	Check the burner orifice for stoppage. Remove stoppage.
	E. Wall switch or wires.	Follow the corrective action in Symptom and Possible Cause 1.a
		above. Check the switch and wiring.
4. Frequent pilot outage	A. Pilot flame may be too high or	Clean thermocouple and adjust the pilot flame for proper flame
problem.	too low, or blowing out (high	impingement. Follow lighting instructions carefully.
	pressure), causing pilot safety
	to drop out.
5. The pilot and main	A. No LP in tank.	Check the LP (propane) tank. Refill the fuel tank.
burner extinguish while in
	B. Improper gas inlet pressure.	Verify with manometer. NG should read 5-14 inches w.c. LP should
operation.
		read 10-14 inches w.c.
	C. Inner vent pipe leaking exhaust	Check venting system for damage. Replace/repair improperly
	gases back into the system.	assembled pipe sections.
	D. Glass installed improperly.	Check to ensure glass is installed properly. Replace glass panel
		assembly.
	E. Failed thermopile or	Replace pilot if necessary.
	thermocouple.
	F. Improper vent cap installation.	Check for proper installation and freedom from debris or blockage.
6. Glass soots.	A. Flame impingement.	Adjust the log set so that the flame does not excessively impinge on
		it. Refer to log instructions.
	B. Improper air shutter setting.	Refer to manual for shutter set points. Ensure that set point is
		correct for appliance/gas type. If unit has adjustable shutter, it may
		be necessary to increase shutter opening.
	C. Debris around air shutter.	Inspect the opening at the base of the burner. NO MATERIAL
		SHOULD BE PLACED IN THIS OPENING.
7. Flame burns blue and lifts	A. Insufficient oxygen being	Ensure that the vent cap is installed properly and free of debris.
off burner.	supplied.	Ensure that the vent system joints are tight and have no leaks.
		Ensure that no debris has been placed at the base of, or in the area
		of the air holes in the center of the base pan beneath the burner.
		Ensure that the glass is tightened properly on the unit, particularly
		on top corners.

Heatilator • Caliber Mesh CD Series-SIT Valve • 4040-849 Rev J • 06/08 59