Thermo Products CDX1-125N, CDX1-75N, CHX1-125N, CHX1-75N, CHX1-100N REPLACE THE 50V61-143CONTROL

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

IS THERE 24 VOLTS ACROSS "MVH" AND "MV COM" ON 50V61-143 CONTROL?

NO

REPLACE THE

50V61-143 CONTROL.

YES

IS THE VARIABLE SPEED AIR FAN OPERATING?

YES

CHECK CONNECTIONS

TO GAS VALVE. IF OK,

REPLACE GAS VALVE.

NO				NO
		DOES BLOWER
		SPIN FREELY?
			YES
		REFERENCE ECM
	OPERATION MANUAL

CONFIRM IF EITHER BLOWER WHEEL

IS RUBBING AGAINST HOUSING OR MOTOR SHAFT IS SPINNING FREELY AND REPAIR OR REPLACE AS NECESSARY

DOES SYSTEM RUN UNTIL THERMOSTAT IS SATISFIED?

YES

NO

IS LED LIGHT

ON 50V61-143

CONTROL FLASHING?

YES

REFERENCE LED

CHART ON PG. 34

OF THIS MANUAL.

NO

CHECK ALL WIRING FOR LOOSE CONNECTIONS.

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