Troubleshooting; Troubleshooting Charts - Lochinvar EW150 Installation & Service Manual

8

Troubleshooting

WITH 120 VAC POWER TO
STEP
APPLIANCE, TURN ON POWER
1
SWITCH, SWITCH LIGHTS UP?
YES
STEP
IGNITION CONTROL MODULE?
2
YES
STEP
SET THERMOSTAT BELOW
3
WATER TEMPERATURE.
YES
STEP
SET THERMOSTAT TO CALL
4
FOR HEAT.
YES
STEP
COMBUSTION AIR BLOWER
5
(CAB) STARTS?
YES
STEP
AIR PROVING SWITCH
6
CLOSES?
YES
STEP
IGNITION MODULE PURGE
7
"LED" LIGHTS UP?
YES
STEP
IGNITION MODULE IGNITER "LED"
8
LIGHTS UP & PURGE "LED" TURNS OFF?
YES
TROUBLESHOOTING CHART
NO 120 VAC POWER TO UNIT?
CHECK WIRING TO SWITCH?
CHECK 120 VAC THRU SWITCH?
120 VAC MODULE?
NO
REPLACE MODULE.
NOTE: THIS CHART IS FOR
CONTINUOUS PUMPS ONLY.
SEE INSTALLATION INSTRUCTIONS
FOR INTERMITTENT PUMP AND
PUMP DELAY OPTIONS FOR
PUMP OPERATION.
NO AIR PROVING SWITCH OPEN?
YES
CHECK FOR 120 VAC
AT CAB?
AIR SHUTTER ADJUSTMENT
NO
CORRECT? SEE INSTRUCTIONS.
YES
"LED" BURNED OUT BUT CONTROL
NO
FUNCTIONS. REPLACE AT A
CONVENIENT TIME.
NO
Installation & Service Manual
NO
YES
NO
YES
NO
NO
CHECK WIRING CONNECTIONS.
YES
NOTE: MUST OPEN WITHIN
45 SEC. AFTER CALL FOR
HEAT AND CLOSE WITHIN
5 MIN. AFTER CAB STARTS
OR MODULE LOCKS OUT.
NO
NO
YES
REPLACE CAB.
ADJUST AIR SHUTTER TO
NO
PROPER SET POINTS; CHECK
FOR AIR LEAKS FROM BURNER
COMPARTMENT / PRESSURE HOSE.
REPLACE SWITCH.
"LED" BURNED OUT BUT CONTROL
FUNCTIONS. REPLACE AT A
CONVENIENT TIME.
CHECK 120 VAC POWER SUPPLY.
CHECK WIRING CONNECTIONS.
REPLACE SWITCH.
REPLACE SWITCH.
CHECK WIRING CONNECTIONS.
45