CLIMATEMASTER GEOTHERMAL

Re: Code 8

Code 8 = Unit Performance Sentinel (UPS) Warning

• The UPS warning is NOT a Lockout condition. 
• The UPS feature is intended to indicate when the heat pump is operating inefficiently.
• A UPS condition exists when:
  • In heating mode with compressor energized, FP2 is greater than 125°F [52°C] for 30 continuous seconds
  • In cooling mode with compressor energized, FP1 is greater than 125°F [52°C] for 30 continuous seconds
  • In cooling mode with compressor energized, FP2 is less than 40°F [4.5°C] for 30 continuous seconds.
• If a UPS condition occurs, the control will immediately go to UPS warning.
• The status LED will remain on as if the control is in normal mode.
• Outputs of the control will NOT be affected by UPS.
• During UPS warning, the alarm relay will cycle on and off.
  • The cycle rate will be “on” for 5 seconds, “off” for 25 seconds, “on” for 5 seconds, “off” for 25 seconds, etc.

WHAT TO LOOK FOR:

• Bad FP1 or FP2 sensor (see sensor resistance chart)

Cooling Mode

• FP1 less than 40 deg.
  • Low freon
  • Bad expansion valve
  • Low indoor airflow
• FP2 greater than 125 deg.
  • Low water flow

Heating Mode

• FP2 greater than 125 deg.
  • Low indoor airflow

HOW TO DISABLE UPS:

The UPS feature can be disabled by changing a dip switch on the CXM board.

DIP Switch S1 - Switch 1: Unit Performance Sentinel Disable - provides field selection to disable the UPS feature.

On = Enabled. Off = Disabled