All installations and services must be performed by qualified service personnel.
IS THERE 24 VOLTS ACROSS "MVH" AND "MV COM" ON
YES
NO
REPLACE THE
IS THE VARIABLE SPEED AIR FAN OPERATING?
YES
CHECK CONNECTIONS
TO GAS VALVE. IF OK,
REPLACE GAS VALVE.
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| DOES BLOWER |
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| SPIN FREELY? |
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| YES |
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| REFERENCE ECM |
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| OPERATION MANUAL |
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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
CONTROL FLASHING?
YES |
REFERENCE LED
CHART ON PG. 48
OF THIS MANUAL.
NO
CHECK ALL WIRING FOR LOOSE CONNECTIONS.
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