29 68-0076—1
Troubleshooting
HEAT PUMP OR AUXILIARY HEAT
WO N'T OPERATE NO ac POWER TO THERMOSTAT CHECK POWER TO HEAT PUMP OR
AUXILIAR Y HEATI NG SYST EM
–ON-OFF SWITCH
–FUSE O R CIR CUIT BREAKER
–LOOSE 24 V CONNECTION
-AT T HER MO STAT
-AT HEAT PUMP OR AUXILIAR Y HEATI NG SYSTEM
–I NCOR RECT WIRI NG
-CHE CK WIRING DIA GR A M
T HE RMOSTAT INOP E RATIVE CO NDUCT SELF- TEST ; SEE CHECK OUT.
PRESENT SETTING TOO LOW/HIGH ADJUST T EMPERATURE BY PUSHING WARMER/ COO LER
KEYS.
SYSTEM SWITCH ON THERMOSTAT IN
WRONG POSITION RESE T THE RMOSTAT SYST EM SWIT CH.
MINIMUM-OFF TIMES IN THERMOSTAT IN
OPERATION ON COOLING OR HEATING WAIT 5-10 MIN. OR USE SELF-TEST IN THERMOSTAT.
SEE CHE CK OUT.
I NCOR RECT WIRI NG CHECK CIR CUIT DI A GR A M .
HEAT PUMP OR AUXILIARY HEAT SYST EM
INOPERATIVE CONSULT HEAT PUMP/AUXILIAR Y HEAT SYST EM
INSTRUCTIONS.
S YMPTOM POS S IBLE CAUS E ACTION
PA RT IAL DISP LA Y INOPERATIVE T HER MO STAT REPLACE THERMO STAT .
NO DISPLAY NO POW ER TO T HER MO STAT CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.
THER MO STAT I N SELF-T EST MODE PR ESS RUN PRO G RAM KEY TWICE.
THER MO STAT MO UNTED INCOR RECTLY
ON BASE SEE INSTALLATION INSTRUCTIONS FOR CORRECT
MOUNTING.
PRESENT SETTING APPEARS
INACCURATE THERMO STAT I S IN RECOVERY MODE •
•
R O O M T EMPERATURE I S NOT W HAT
IS EXPECTED ON WEEKENDS THER MO STAT NOT PROG RAMMED FOR
WEEKENDS REPROGRAM FOR W EEKENDS PER INST RUCTIONS.
THER MO STAT T EMPERATUR E
NEEDS T O BE ADJUST ED ON A
REGULAR BASIS
WARMER/ COO LER KEYS BEING USED
TO ADJUST T EMPERATURE
R EPROGRAM THERMOSTAT TO MAKE PERMANENT
CHANGE IN PR O G RAM. W ARMER/ COO LER KEYS ARE
TEMPO RARY UNLESS PER I O D KEY IS PRESSED FIRST .
PROGRAM IS LOST DUE TO POWER
OUTAGE OR DISPLAY GOES BLANK
WHEN POWER IS TURNED OFF BATT ERIES ARE INCOR RECTLY INSTALLED R EMO VE AND REPLACE PER MARKINGS O N THER MO STAT.
BATT ERIES ARE DEAD R EPLACE BATTERIES.
DISPLAY FLASHES WHILE
PROGRAMMING IMPR O PER PRO G RAM SEQUENCE CHE CK HOMEOWNERS MA NUA L FOR CORRECT P RO GRA M
SEQUENCE.
AUTOMAT I C CHANGEOVER THER MO STAT
HEATING O R COOLING T EMPERATURES
CAN NOT BE SET CLOSER THAN 3°F
SET HEATING AND COOLING T EMPERATURES 3°F O R
MORE APART .
DI SPLAY FLASHES DURING
OPERATION PR O G R AMMI NG HAS BEEN LOST BECAUSE O F
A POWER OUTAGE R EPROGRAM ACCORDING TO PROGRAMMING
INSTRUCTIONS (MAKE SURE BAT T ERIES ARE I NST ALLED).
NORMAL OPERATION THERMOSTAT TURNS ON
HEATING/ COO LING EARLY TO MEET T EMPERATURE
SETTING AT PROGRAMMED TI MES.
R ECOVERY CAN BE ENDED BY PUSHING
WARMER/ COO LER KEYS.
M1020A
R O O M T EMPERATURE DISPLAY
APPEAR S INACCURATE T HER MO STAT HAS SEPAR AT E REMOTE-
MOUNTE D SENSOR
•
•
•
THER MO STAT I S CONTROLLED BY TEMPERAT UR E SENSED
AT REMOTE SENSOR LOCATION.
CHECK TEMPER AT UR E AT R EMO T E SENSO R LOCATION.
MAKE SURE W I RING FROM THER MO STAT LOCATION TO
REMOTE SENSOR LOCATION IS IN GOOD CONDITION.
Start the system by setting the thermostat and observing system response. If problem occurs, establish symptom and use
the following troubleshooting chart to check for possible cause and action.
T8611M