Thermo Products CDX3-125N, CDX3-75N, CHX3-75N Do Burners Stay Lit Past Proof Of Flame Check?

All installations and services must be performed by qualified service personnel.

DO BURNERS STAY LIT PAST PROOF OF FLAME CHECK?

YES

NO

IS IGNITOR NO

POSITIONED CORRECTLY?

YES

CHECK AND CLEAN BURNERS

CHECK FOR PROPER LINE

AND MANIFOLD PRESSURE

REFERENCE GAS

PRESSURE CHART PAGE 31.

OK

CHECK FLAME PROB2

AND WIRE AND CHECK

POLARITY ON INCOMING

POWER AND GROUND

REPOSITION TO CORRECT LOCATION

IS W2 ENERGIZED?

NO

YES	DOES INDUCER	NO
	GO TO
	HIGH SPEED?

YES

DOES BURNER NO

STEP TO HIGH FIRE?

IS THERE LINE
VOLTAGE ACROSS		NO
INDUCER POWER
TERMINALS "IND HI"
TO "IND N"?
	YES

CHECK CONNECTIONS

TO INDUCER. IF OK,

REPLACE INDUCER.

IS THE HIGH FIRE	NO
PRESSURE SWITCH
CLOSED?

REPLACE

THE 50V61-143

CONTROL.

CHECK

CONTACTS

IN HIGH

FIRE SWITCH

AND FOR

BLOCKAGE IN FLUE. IF OK,

REPLACE DUAL

PRESSURE

YES

YES

SWITCH.

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