NZ Error Codes

pCOe Offline

There is a communication problem with the controller

⇒ Fix;

• Check cable connections at J29 on pCOOEM+ for good conection of terminal block and wires.
• Check J3 on pCOe module for good connection of terminal block and wires.
• If any SGx groups are used and sensor not installed the error will show.
• Restart unit; turn off power for 3 mins to control circuit and compressor circuit.

Low Evap Temp

Refrigerant Evap Temp is getting below brine temp and possibly creating ice.

⇒ Fix;

• Check antifreeze concentration.
• Check pumping is getting good appropriate flow.
• Check protection setting is set correctly. Installer Menu > Configuration > Protections; Minimum temperature should be set to the same or slightly above your measure antifreeze protection.
  • In cooling, check Production Protection screen
  • In Heating mode, check Brine Protection screen
• For water only set to 4°C or 39°F.
• Possible Refrigerant leak. See Low Evap Flow for other possiblities.

Call for further assistance.

Failed Outdoor sensor

If outdoor sensor has failed to operate or has a communication problem.

⇒ Fix;

• Measure R/C power to the sensor and verfiy it isn’t getting voltage above 27Vac.
• If using factory transformer, set primary power wires to +5% and O.
• If sensor not operational change the following.
  • Heating or Cooling service to fixed temp in Installer > Configuration > Services > Heating
  • Change StopT
    • For Heating; User Menu > Heating, set StopT to anything above 1C.
    • For Cooling; User Menu > Cooling, Set StopT to anything below -1C.
• Replace sensor after confirming power is less than 27Vac.

Low Evap Flow

Verify Evap flow is suffient.

• In Heating = Check Source (Brine) side.
• In Cooling = Check Load (Production) Side.

⇒ Fix;

• If connection type is Direct with valves that have an opening delay use compressor delay. Installer Menu > Configuration > Protections > Compressor Delay; Default 0 mins. Use 1 min.
• All valves are closed when compressor is trying to run.
  • Check if manual or motorized valve are closed.
  • Check for Clogged filter
  • Air bubles in circuit?
  • Ice in heat exchanger?
  • Is the circulator pump working correctly?
    • Use manual Test to enable pump and set to 100%. Is wiring correct at PWM outputs AO1 (Source) or AO2 (Load). If using 0-10Vdc output AO6 (Source).
  • Is the Heat Pump model correct? Installer Menu > Heat Pump Model; Verify the 6 digits are the same as the first 6 digits of the fabrication number on the nameplate of the unit.
• Check Wiring of EEV on pCOOEM+ controller at J12 VExp1 connection.
• Check wiring of suction sensor and wiring.

Call if further assistance is required.

pCOe Analog Input 1 or 2 or 3

Control has input on temp groups but temp groups setup incorrect

• SG2 sensor is located at AI12
• SG3 sensor is located at AI13
• SG4 sensor is located at AI14

⇒ Fix;

• If using at Shunt groups (SGx) then a input sensor must be provided. 10kΩ thermistor.
• If sensor is wired check factory wiring from terminal block to controller that connections are good and connector is seated firmly.
  • SG2 = AI12 to pCOOEM+ J26 / U12 & GND
  • SG3 = AI13 to pCOe J9 / B1 & GND
  • SG4 = AI14 to pCOe J9 / B2 & GND

Safety Stop

PS and ESS connections open.

• ESS = External safety switches field installed pressure switch or flow switch.
• PS = Connects to high pressure switch on refrigerant circurt.

⇒ Fix;

• Check for continuity between the pins of ESS-T1 and PS-T1?
  • If yes, check external safeties devices installed
  • If no
• Jumper ESS terminals

Call if further assistance is required.

Warning

T memory is rewritten too often It has been written xxxx times, check variables in *.vvv files at addr: 2402694.

⇒ Fix;

• Changed transformer power from 230V to +5% to reduce 24V output to controller.

Clock Board Fault

• Battery died in pCOOEM+. This is uncommon and should only be at startup.

⇒ Fix;

BR2330 battery needs to be replaced, CR version won’t work.

Requires disassembling PLC cover, 4 tabs in corner, Remove two circuit boards and standoffs. Recommend taking picture of internal connector to board so when reassembling controller it is done correctly.