Honeywell PC8900A Manual page 41

IF THE CHECK LED IS LIT, USE THE FOLLOWING TROUBLESHOOTING INFORMATION.
1. PRESS THE CHECK KEY.
PC8900 DISPLAY SHOWS:
SYMPTOM
NO DISPLAY ON PC8900.
HEATING WILL NOT COME ON.
POSSIBLE CAUSE
W8900 CANNOT READ OUTDOOR AIR
TEMPERATURE.
PC8900 CONFIGURED FOR OUTDOOR
TEMPERATURE SENSOR, BUT NOT
INSTALLED.
WRONG OUTDOOR TEMPERATURE
SENSOR IS INSTALLED.
W8900 CANNOT READ REMOTE SPACE
TEMPERATURE.
PC8900 CONFIGURED FOR REMOTE
SENSOR OPERATION, BUT C7189 IS
NOT INSTALLED.
WRONG REMOTE SENSOR IS
INSTALLED.
TEMPERATURE AVERAGING NETWORK
IS IN USE, BUT SENSORS ARE NOT
CONFIGURED CORRECTLY.
SYSTEM PROBLEM.
LINK BETWEEN PC8900 AND W8900
CANNOT BE ESTABLISHED.
THE PC8900 IS IN THE PROCESS OF
COMMUNICATING WITH THE W8900.
POSSIBLE CAUSE
NO POWER TO PC8900.
NO POWER TO W8900.
PC8900 SYSTEM SETTING IS INCORRECT.
5-MINUTE COMPRESSOR PROTECTION
ACTIVATED.
PC8900 INOPERATIVE.
INCORRECT WIRING.
HEATING EQUIPMENT IS INOPERATIVE.
HEATING SETPOINT IS TOO LOW.
HEATING SYSTEM IS NOT COMPATIBLE.
ROOM TEMPERATURE AT REMOTE
SENSOR LOCATION IS TOO HIGH.
PC8900 CONFIGURED FOR ONLY ONE
STAGE OF HEATING.
Fig. 41. Troubleshooting procedures ( Continued ).
41
ACTION
• CHECK CONNECTIONS BETWEEN C7089 AND W8900.
• RECONFIGURE PC8900 FOR LOCAL SENSOR ONLY.
• CHECK THAT C7089 OUTDOOR TEMPERATURE SENSOR IS
BEING USED.
• CHECK CONNECTIONS BETWEEN C7189 AND W8900.
• RECONFIGURE PC8900.
• CHECK THAT C7189 REMOTE TEMPERATURE SENSOR IS
BEING USED.
• CHECK WIRING OF SENSORS AND COMPARE TO SENSOR
HOOKUP DRAWINGS.
• PRESS CHECK KEY TO VIEW FURTHER MESSAGES ON
PC8900 DISPLAY.
• CHECK CONNECTIONS 2-3 ON PC8900.
• NONE. THE "WAIT" WILL DISAPPEAR IN A SHORT TIME.
ACTION
• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE
OR RESET IF NECESSARY.
• CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.
• MAKE SURE PC8900 IS CORRECTLY MOUNTED ON WIRING
WALLPLATE.
• MAKE SURE TERMINALS 1 THROUGH 4 ARE PROPERLY
CONNECTED BETWEEN PC8900 AND W8900.
• CHECK SYSTEM FUSE OR CIRCUIT BREAKER AND REPLACE
OR RESET IF NECESSARY.
• CHECK THAT HEAT SYSTEM POWER IS ON.
• CHECK FOR LOOSE CONNECTIONS AT PC8900, W8900, C7189,
AND EQUIPMENT.
• CHECK THAT PC8900 IS SET TO HEAT, EM. HT. OR AUTO.
• IN HEAT PUMP APPLICATIONS, THE PC8900 HAS A
5-MINUTE BUILT-IN TIME DELAY (IF ACTIVATED). ALLOW UP
TO FIVE MINUTES AFTER CHANGING THE SETTING BEFORE
THE COMPRESSOR STARTS.
• CONDUCT SELF-TEST. SEE CHECKOUT.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• SEE WIRING DIAGRAM.
• REFER TO MANUFACTURER SPECIFICATIONS TO
TROUBLESHOOT EQUIPMENT.
• ADJUST SETPOINT USING AND
• REFER TO WIRING DIAGRAMS. ADD R8222 RELAY, R8339
CONTROL CENTER, OR S566 SWITCH IF REQUIRED.
• RELOCATE REMOTE SENSOR WHERE IT IS NOT AFFECTED
BY HOT AREAS, COLD AREAS, OR DEAD-AIR AREAS.
• RECONFIGURE PC8900 TO ACCOMMODATE ALL STAGES OF
HEAT REQUIRED.
M6193B
KEYS.
M18742
68-0173—3