Lochinvar 000 Btu/hr, CP-5M-4/08, 45, RSB-i&s-05, 000 - 500 warranty Troubleshooting Guide, Step

TROUBLESHOOTING GUIDE

45,000 - 500,000 Btu/hr Models - Boilers & Water Heaters F9/M9

STEP 1:	Is the spark
	igniter sparking?
		YES
STEP 2:	Is the pilot
	staying ON?

YES

		Check continuity of the spark				Check for an open
		cable. Check for 24VAC on				sensor. If not open,
NO
						replace temperature
		the TH terminal (gray wire) on
		the ignition module.				controller.
	Check the pilot
NO	tube for gas.		NO
					YES
	Check for draft.
							NO
				Replace ignition
				module.

STEP 3: Is the gas valve getting 24VAC?

NO

Is there 24 VAC (purple wire) on the 4-pin connector plug on the temperature controller?

Replace ignition module.

NO

YES Is there 24VAC (tan wire) on the

4-pin connector plug on the temperature controller?

YES

Check X and B on the terminal strip if the flow switch is installed. Check for an open auto reset high limit.

Check vent damper, 3-pin louver relay connectors, and venter proving.

Check 24VAC at R and W on

Check the vent damper or the vent damper plug and

the (EMS) terminal strip.

NO

the voltage to and from the transformer.

YES

Check all safety limit devices.

Check 4-pin low water cutoff connector.

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