Thermo Pride Gas/Propane Furnace Premiere Series 2-Stage CHX3 - Manual (Page 55)

All installations and services must be performed by qualified service personnel.
49
SET THERMOSTAT TO CALL FOR HEAT
(MAKE CERTAIN ROOM TEMPERATURE IS BELOW THERMOSTAT SETTING)
CHECK INPUT POWER,
DOOR INTERLOCK,
SERVICE SWITCH
AND FUSES
IS THE INDUCER
BLOWER OPERATING?
CHECK 115 VOLT
CONNECTIONS. IF OK,
REPLACE TRANSFORMER
YES
NO
YES
YES
NO NO
IS THERE 24V
ACROSS R AND B/C
NO
IS THERE 24 VOLTS
ACROSS "R" AND "W1"?
CHECK WIRING TO
THERMOSTAT. IF OK,
REPLACE THERMOSTAT.
YES
NO
CHECK WIRING TO INDUCER
AND IF OK, REPLACE
INDUCER ASSEMBLY.
YES
YES
NO
TROUBLESHOOTING GUIDE
THE SYSTEM IS STARTED BY SETTING THE THERMOSTAT TO CALL FOR
HEAT. THE FOLLOWING SHOULD HELP ESTABLISH THE TYPE OF
MALFUNCTION OR DEVIATION FROM THE NORMAL OPERATION.
NOTE: REFER TO PAGE 48 FOR DEFINITION OF DIAGNOSTIC LEDS.
TO USE THIS DIAGRAM, YOU JUST NEED TO FOLLOW THE INSTRUCTIONS IN THE BOXES.
IS THERE 120 VOLTS
ACROSS "L1" AND
"NEUTRAL" AT THE
50V51-843 CONTROL
MODULE?
IS THERE 24 VOLTS
ACROSS "TH" & "TR"
AT THE INTEGRATED
CONTROL MODEL
50V51-843?
CHECK FUSE ON
W/R 50V51-843
IS THERE LINE VOLTAGE
ACROSS INDUCER POWER
TERMINALS "IND HI" TO
"IND N" OR "IND LO" TO
"IND N" AT THE 50V51-843
CONTROL?
REPLACE THE
50V51-843 CONTROL.