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