Thermo Pride CDX1-100N Installation And Operation Manual page 52

All installations and services must be performed by qualified service personnel.
IS THE VARIABLE
SPEED AIR FAN
OPERATING?
YES
DOES SYSTEM RUN
UNTIL THERMOSTAT
IS SATISFIED?
YES
NO DOES BLOWER
SPIN FREELY?
YES
REFERENCE ECM
OPERATION MANUAL
IS LED LIGHT
NO
ON 50V61-143
CONTROL FLASHING?
YES
REFERENCE LED
CHART ON PG. 34
OF THIS MANUAL.
IS THERE 24 VOLTS
ACROSS "MVH" AND
"MV COM" ON
50V61-143 CONTROL?
YES
CHECK CONNECTIONS
TO GAS VALVE. IF OK,
REPLACE GAS VALVE.
NO
NO
46
NO REPLACE THE
50V61-143 CONTROL.
CONFIRM IF EITHER
BLOWER WHEEL
IS RUBBING AGAINST
HOUSING OR MOTOR
SHAFT IS SPINNING
FREELY AND REPAIR
OR REPLACE AS
NECESSARY
CHECK ALL WIRING FOR
LOOSE CONNECTIONS.