Alpha E-Tec Hybrid - Error Codes and Fault Finding
10.3 BOILER ERROR CODES AND FAULT FINDING
Error
code
Fault
Fault description
Possible causes
Return sensor fault
Flow sensor fault
Flow temperature increase
(during DHW)
Flow temperature increase
System water high
temperature
Power supply voltage
anomaly
High pressure error
Overheat
DHW cylinder overheat
DHW cylinder heating
Liquid probe error
PCB fault detected
High pressure switch fault
High pressure switch fault
Compressor overload
Compressor start anomaly
Fan anomaly
Fan anomaly
Compressor high current
anomaly
DHW temperature fault
Power supply voltage to
compressor
High pressure switch error
Compressor start
anomally
Incorect reading from heat pump return sensor
(water inlet)
Incorrect reading from heat pump flow sensor
(water outlet)
Abnormal flow temperature increase in the
outdoor unit during DHW mode
Abnormal flow temperature increase in the
outdoor unit
System water circuit overheating
The supply voltage to the outdoor unit is out of
the normal range
Outdoor unit evaporator/condenser fault
(evaporator temperature below 0°C or condenser
temperature
≥
59.5°C
Outdoor unit sensors overheat anomaly
DHW clyinder high temperature reading
DHW heating time greater than 6 hours
Compressor liquid phase temperature sensor
fault
EEPROM control board error
High pressure switch intervention
The pressure sensor has activated repeatedly (16
times in 300 minutes)
Compressor inverter overheat detected
Compressor motor rotation anomaly
Fan stopped on start up
Fan rotation anomaly
Compressor power supply voltage too high
Abnormal DHW temperature increase
Compressor power supply voltage out of range
before start up
High pressure switch fault
The compressor does not start up properly
Check sensor fitting
Check sensor connections
Check sensor for damage or incorrect readings
Check sensor fitting
Check sensor connections
Check sensor for damage or incorrect readings
Check pipework is connected correctlly
Check flow sensor
Check gas boiler diverter valve
Check pipe connections
Check all valves are open
Check for blockages or flow restrictions
Check pipe connections
Check all valves are open
Check for blockages or flow restrictions
Check cable condition and connections
Check for water ingress or short circuit
connections
Check main power supply, consumer and
breaker for faults
Check the evaporator fins are clean and clear
Check the condesation drainage is clear
Check for freezing faults or ice build up
Check compressor pipes for signs of leaks
Check all heat pump sensors
Check cylinder for potential overheating
Check back up heater functions
Check DHW cylinder sensor
Check for correct diveter valve directions
Check for excessive hot water demand or draw
off
Check DHW cylinder coil transfer too slow or
scale build up
Check for correct compressor function
Check wiring to PCB and connections
Check for water ingress on electrics
Check pressure switch function and connections
High pressure in compressor circuit
Check the pressure switch and connections
Check for compressor function issues
Faulty compressor in heat pump
Compressor start capacitior faulty
Faulty compressor in heat pump
Fan faulty or jammed
Fan blocked
Fan blades excessively dirty
Fan blades or housing damaged
Faulty compressor in heat pump
Check sensor position and connections
Check back up immersion operation
Check for additional heat sources (Solar/PV etc.)
Check cable condition and connections
Check for water ingress or short circuit
connections
Check high pressure switch function and
connections
Check compressor electrical connections
Heat pump compressor fault
List of Outdoor Unit Error codes – Shown on the Smartech Control and the user App.
1006
1008
1015
1016
1019
1020
1021
1022
1024
1026
1032
1036
1039
1040
1043
1044
1045
1046
1050
1054
1057
1060
1064
39
