Faults
Display
Type of fault
Temperature sensor
measured results
incorrect.
Defrost sensor meas-
ured result incorrect.
ERR.01
Refrigerant low.
Expansion valve
faulty.
Compressor not
working.
Minimum water tem-
perature "T°C MINI"
enabled.
Temperature sensor
ERR.02
measured results
incorrect.
Temperature sensor
ERR.03
measured results
incorrect.
Defrost sensor and
domestic hot water
ERR.04
sensor measured
results incorrect.
Software fault on
ALARM EPrO
display board.
Defrost sensor meas-
ERR.08
ured result incorrect.
www.dimplex.de
Cause
Air and defrost sensor
connections reversed on
board.
Domestic hot water and
defrost sensor connec-
tions reversed on board.
Falsified measured val-
ues due to loose, uninsu-
lated defrost sensor in
refrigeration circuit.
Leakage in refrigeration
circuit.
Expansion valve faulty or
sensor break on expan-
sion valve.
Compressor faulty.
Air and domestic hot
water sensor connec-
tions reversed on board.
Air, defrost and/or
domestic hot water sen-
sor connections
reversed.
Defrost and domestic
hot water sensor con-
nections reversed on
board.
Display board faulty.
Defrost sensor faulty.
FD 0303
Temporary Function /
Measures required
Resolution
Replace sensor con-
nection on board.
Install defrost sensor
securely in refrigera-
tion circuit and insulate
properly.
Find and seal leakage
(solder).
Fill refrigeration circuit
Domestic hot water
with refrigerant quan-
heat pump off.
tity specified in device
information (only to be
carried out by qualified
refrigeration engineer)
Replace expansion
valve.
Replace compressor.
Replace sensor con-
Domestic hot water
nection on board.
heat pump off.
Replace sensor con-
Domestic hot water
nection on board.
heat pump off.
Replace sensor con-
Domestic hot water
nection on board.
heat pump off.
Replace display and
Domestic hot water
board.
heat pump off.
Domestic hot water
heat pump in alternative
Replace sensor.
operation (el. supple-
mentary heating or 2nd
heat generator).
English
EN-29