Troubleshooting - Honeywell PC8900A Manual

TROUBLESHOOTING

See Fig. 41 for troubleshooting procedures.
IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION.
1. PRESS THE CHECK KEY.
PC8900 DISPLAY SHOWS:
a
IF THE COMM CHK LIGHT IS CAUSED BY HEAVY COMMUNICATION FROM THE CM8900, IT DISAPPEARS IN 5 SECONDS. NO ACTION IS NEEDED.
68-0173—3
POSSIBLE CAUSE
COMMUNICATIONS WITH THE HOME
SYSTEM AND W8900 CANNOT
BE ESTABLISHED.
a
CONNECTION BETWEEN PC8900 AND
W8900 CANNOT BE ESTABLISHED.
DISCHARGE AIR SENSOR IS PRESENT
AND INDICATES A COOL SYSTEM
FAILURE WHILE IN COOLING MODE.
WRONG DISCHARGE AIR SENSOR IS
INSTALLED.
W8900 CANNOT READ DISCHARGE
AIR TEMPERATURE.
PC8900 CONFIGURED FOR DISCHARGE
AIR TEMPERATURE SENSOR, BUT NOT
INSTALLED.
WRONG DISCHARGE AIR SENSOR IS
INSTALLED.
FAN RUN TIME HAS EXCEEDED
720 HOURS.
DISCHARGE AIR SENSOR IS PRESENT
AND INDICATES A HEAT SYSTEM
FAILURE WHILE IN HEATING MODE.
WRONG DISCHARGE AIR SENSOR
IS INSTALLED.
HEAT PUMP COMPRESSOR FAILURE
RELAY HAS ENERGIZED W8900 L
TERMINAL.
W8900 CANNOT READ OUTDOOR AIR
TEMPERATURE.
PC8900 CONFIGURED FOR OUTDOOR
TEMPERATURE SENSOR, BUT NOT
INSTALLED.
WRONG OUTDOOR TEMPERATURE
SENSOR IS INSTALLED.
W8900 CANNOT READ DISCHARGE
AIR TEMPERATURE.
PC8900 CONFIGURED FOR DISCHARGE
AIR TEMPERATURE SENSOR, BUT NOT
INSTALLED.
WRONG DISCHARGE AIR SENSOR IS
INSTALLED.
PC8900 HUMIDITY SENSOR IS
INOPERATIVE.
PC8900 TEMPERATURE SENSOR HAS
FAILED.
Fig. 41. Troubleshooting procedures.
ACTION
• CHECK CONNECTIONS BETWEEN HOME SYSTEM AND
COMMUNICATION MODULE.
• CHECK COMMUNICATIONS BUS.
• RECONFIGURE PC8900
• RECONFIGURE PC8900.
• CHECK CONNECTIONS BETWEEN C7100 AND W8900.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.
• CHECK CONNECTIONS BETWEEN C7100 AND W8900.
• RECONFIGURE PC8900.
• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.
1. CLEAN AIR CLEANER CELLS OR REPLACE AIR FILTER.
2. PRESS CANCEL KEY WHILE VIEWING FILT CHG MESSAGE.
• CHECK CONNECTIONS BETWEEN C7100 AND W8900.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• CHECK THAT C7100 DISCHARGE AIR SENSOR IS BEING USED.
• CHECK HEAT PUMP. REFER TO MANUFACTURER
SPECIFICATIONS TO TROUBLESHOOT EQUIPMENT.
• CHECK CONNECTIONS BETWEEN C7089 AND W8900.
• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.
• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS
BEING USED.
• CHECK CONNECTIONS BETWEEN C7100 AND W8900.
• RECONFIGURE PC8900.
• CHECK THAT C7100 AVERAGING DISCHARGE AIR SENSOR IS
BEING USED.
• REPLACE PC8900.
• REPLACE PC8900.
• RECONFIGURE PC8900 FOR REMOTE SENSOR USE.
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M6193A