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ALARMS AND ERROR CODES
The unit will sound an alarm and display an error code in the event of a malfuncon. If the unit is sound-
ing an alarm, note the ashing error code and turn o the unit by pressing the ‘O’ buon. Contact
support at AirGenerate before aempng to turn on the unit. Error codes range from A0 to A8.
Codes A0 to A4 are specic to inbuilt sensors in the unit:
A0: Upper water temperature sensor (T1) malfuncon. Since this sensor controls the primary electric heater, you will not be
able to run the unit in Auto or Heater modes. Switch to Econ mode or acvate Back-up heater by following the ‘Acvang Back-
up Heater’ procedure. Obtain new sensor from AirGenerate and follow sensor replacement procedure.
A1: Lower water temperature sensor (T2) malfuncon. Since this sensor controls the heat pump, you will not be able to run the
unit in Auto or Econ modes. Switch to Heater mode or acvate Back-up heater by following the ‘Acvang Back-up Heater’
procedure. Obtain new sensor from AirGenerate and follow sensor replacement procedure.
A2: Evaporator coil temperature sensor (A2) malfuncon. Since this sensor aects heat pump performance, you will not be able
to run the unit in Auto or Econ modes. Switch to Heater mode or acvate Back-up heater by following the ‘Acvang Back-up
Heater’ procedure. Obtain new sensor from AirGenerate and follow sensor replacement procedure.
A3: Compressor discharge temperature sensor (A3) malfuncon. Since this sensor aects heat pump performance, you will not
be able to run the unit in Auto or Econ modes. Switch to Heater mode or acvate Back-up heater by following the ‘Acvang
Back-up Heater’ procedure. Obtain new sensor from AirGenerate and follow sensor replacement procedure.
A4: Ambient temperature sensor (A4) malfuncon. Since this sensor aects heat pump performance, you will not be able to run
the unit in Auto or Econ modes. Switch to Heater mode or acvate Back-up heater by following the ‘Acvang Back-up Heater’
procedure. Obtain new sensor from AirGenerate and follow sensor replacement procedure.
A5: Operang pressure outside normal range. Check the following:
1. Ensure that the tank is completely full with water (especially if this is a new install and you are turning the unit on for the
rst me). Check this by opening a hot water faucet – water must ow in a steady, uninterrupted manner.
2. If the ambient temperature is close to the low or high ambient temperature operang limit, switch to Heater mode tempo-
rarily. Revert to Auto or Econ mode when ambient temperature has normalized.
3. If the unit is ducted, remove the duct and operate the unit.
4. If the alarm is sll not resolved, follow these steps and report ndings to AirGenerate support.
a. Deacvate alarm & let the unit run in Econ mode (to de-acvate A5 alarm, set parameter F50 to zero)
b. Check amperage (place a clamp meter around one of the live/hot wires)
c. Check exhaust temperature
d. Check evaporator coil temperature (A2) by pressing the ‘Down’ arrow buon
e. Check compressor discharge temperature (A3) by pressing ‘Up’ and ‘Down’ arrow keys together.
IMPORTANT: Do not run the unit for more than 15 minutes in Econ mode. Aer taking these readings, switch to Heat-
er mode again. Re-acvate alarm A5 by seng parameter F50 to 1.
f. If AirGenerate support recommends a refrigerant recharge, follow ‘Refrigerant Recharge’ procedure.
AirGenerate support may also request that addional troubleshoong measures or temperature readings be taken.
A6: Primary electric element over-heang. Switch to Econ mode or acvate back-up heater temporarily. Obtain new sensor (T1)
and new primary electric element from Airgenerate. Follow sensor and element replacement procedures.
ALARMS &
ERRORS CODES
MAINTENANCE DUCTING
CONTROLS &
OPERATING LOGIC
SPECIFICATION
FAQs APPENDIX