Thermo Products CMA2-75N, CMA1-50N service manual At The Integrated Control?

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

Yes Yes

IS THERE LINE VOLTAGE ACROSS INDUCER POWER TERMINALS "IND" & "IND N"

AT THE INTEGRATED CONTROL?

Yes

CHECK WIRING TO INDUCER

AND IF OK, REPLACE

INDUCER ASSEMBLY.

No

CHECK THE INTEGRATED

CONTROL DIAGNOSTIC LED

LAMP. RESET BY INTERRUPTING POWER TO CONTROL FOR MORE THAN ONE SECOND. IF LED STAYS ON CONTINUOUSLY, REPLACE INTEGRATED CONTROL.

DOES THE HOT	No	IS THERE VOLTAGE PRESENT	No	CHECK THE INTEGRATED CONTROL
SURFACE				DIAGNOSTIC LED LAMP. RESET BY
		AT THE HOT SURFACE
IGNITOR ENERGIZE			INTERRUPTING POWER TO CONTROL
		IGNITOR TERMINALS
AND GLOW?				FOR MORE THAN ONE SECOND. IF
		"IGN" & "IGN N" AT THE
				LED STAYS ON CONTINUOUSLY,
		INTEGRATED CONTROL?
				REPLACE INTEGRATED CONTROL.
		Yes
		CHECK WIRING TO
Yes		HOT SURFACE IGNITOR
		AND IF OK, REPLACE
	HOT SURFACE IGNITOR ASSEMBLY.
		CHECK ACROSS "MV"
AFTER HOT SURFACE		TERMINALS ON INTEGRATED		No
	No	CONTROL FOR 24 VOLTS DURING			SAME AS ABOVE.
IGNITOR WARM-UP,		THE 4 SECOND FLAME PROVING
DOES GAS VALVE OPEN?		PERIOD AFTER IGNITOR WARM-UP.
		IS THERE 24VOLTS?
Yes		Yes
		CHECK WIRING TO GAS
		VALVE AND IF OK,
		REPLACE GAS VALVE.

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