Energy Tech Laboratories MR212 manual Burner Troubleshooting Chart, Proper Spark Gap

Burner Troubleshooting Chart

Problem	Potential Cause	Corrective Action
Pilot Does Not Light/Stay Lit	Main gas if off	Open main gas valve
	Air in gas line	Purge gas line
	Dirt in pilot orifice	Clean orifice with compressed air
	Gas pressure out of range	Adjust to proper gas pressure
	Pilot valve is off	Turn pilot valve on
	Pilot orifice fitting leak	Tighten pilot orifice
	Excessive drafts	Re-direct draft away from unit
	Safety device has cut power	Check limits and airflow switch
	Dirty flame sensor	Clean flame sensor
	Remote panel in “Vent” mode	Change to “Heat” mode
	No spark at igniter	Check wiring, sensor, and ignition
		controller. Check spark gap as shown
		below.
Main Burner Does Not Light	Defective valve	Replace combination valve
(Pilot is Lit)	Loose valve wiring	Check wiring to valve
	Defective pilot sensor	Replace pilot sensor
	Shut off valve closed	Open shut off valve
	Defective flame safety controller	Replace flame safety controller
	Pilot fails as main gas valves open	Plug the first burner port next to the
	and main gas begins to flow	pilot gas tube with burner cement
Not Enough Heat	Main gas pressure too low	Increase main gas pressure – do not
		exceed 14 in. w.c. inlet pressure (5 psi.
		on size 4-5 heater)
	Too much airflow	Decrease airflow if possible
	Burner undersized	Check design conditions
	Gas controls not wired properly	Check wiring
	Thermostat setting too low	Increase thermostat setting
	Thermostat malfunction	Check/replace thermostat
	Unit locked into low fire	Check wiring
Too Much Heat	Defective modulating gas valve	Check/replace modulating valve
	Thermostat setting too high	Decrease thermostat setting
	Unit locked into high fire	Check wiring
	Thermostat wired incorrectly	Check thermostat wiring

Proper Spark Gap

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