Lockout Codes - Baxi MK SYSTEM Installation, User And Service Manual

Code Message
H06.76 ODU return temp err
H06.77 ODU EEPROM error
H06.78 ODU internal com Err
H06.79 ODU flow temp err
H06.80 HE frost protection
H06.81 Evaporator error
13.1.4

Lockout codes

7856310 - v02 - 21122023
Description
Return temperature sensor is on error in the outdoor unit
Error code shown on the digital display of the outdoor unit: Ed
Check the sensor resistance
The connector for the Tw_in sensor is loose. Reconnect it.
The connector for the Tw_in sensor is wet or contains water. Drain the water and dry
the connector. Add a waterproof adhesive
The Tw_in sensor is faulty. Replace it with a new sensor.
EEPROM error in hydronic system main control board in the outdoor unit
Error code shown on the digital display of the outdoor unit: EE
The EEprom parameter is incorrect. Rewrite the EEprom data.
The EEprom chip is broken. Replace it with a new EEprom chip.
The main control PCB for the hydraulic module is broken. Replace it with a new
PCB.
Communication error between refrigerant system and hydronic system main control
boards
Error code shown on the digital display of the outdoor unit: H0
The cable is not connecting the main PCB B and the main control PCB of the hy­
draulic module. Connect the cable.
The communication cable order is incorrect. Reconnect the cables in the correct or­
der.
There is significant magnetic or electrical interference caused by lifts, large electrical
transformers, etc. Add shielding to protect the unit or move the unit.
Flow temperature sensor is on error in the outdoor unit
Error code shown on the digital display of the outdoor unit: HA
The connector for sensor Tw_out is loose. Reconnect it.
The connector for sensor Tw2 is loose. Reconnect it.
The connector for sensor Tw2 is wet or contains water. Drain the water and dry the
connector. Add a waterproof adhesive.
sensor Tw2 is faulty. Replace it with a new sensor.
ODU water side heat exchanger anti-freeze protection
Error code shown on the digital display of the outdoor unit: Pb
The unit will resume normal operation.
Evaporator error in the outdoor unit
Refer to the installation manual for the outdoor unit for the codes linked to
the outdoor unit.
A lockout code signals a major anomaly affecting the heating system: the
heating system is shut down as the safety conditions are not fulfilled.
Two operations are necessary for the system to resume normal operation:
1. Remove the causes of the anomaly.
2. Acknowledge the error message manually on the user interface.
When one of the codes below is displayed, contact the professional
responsible for maintenance of the heat pump.
13 Troubleshooting
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