Lochinvar CP-5M-4/08, 45, RSB-i&s-05 90,000 - 270,000 Btu/hr Models - Water Heaters F1, Step Step

TROUBLESHOOTING GUIDE

90,000 - 270,000 Btu/hr Models - Water Heaters F1

STEP 1:

Is the pilot lit?

YES

NO

Check for gas. Check the pilot assembly and thermocouple. Check the gas valve for proper operation. Clean and replace.

Check for an open sensor. If not open, replace temperature controller.

NO

STEP 2:

STEP 3:

Is the gas valve getting 24VAC?

YES

Unit is running.

NO

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

YES

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

YES

NO

Check 24VAC at R and W on
the (EMS) terminal strip.	NO

YES

Check all safety limit devices.

Check 4-pin low water cutoff connector.

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 the vent damper or the vent damper plug and the voltage to and from the transformer.

45