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7
Service and Maintenance
Error Codes (FTC)
Code Error
Circulation water temperature overheat protec-
L3
tion
DHW tank water temperature overheat protec-
L4
tion
FTC temperature thermistor (THW1, THW2,
L5
THW5A, THW5B, THW6, THW7, THW8, THW9)
failure
L6
Circulation water freeze protection
L8
Heating operation error
Low primary circuit flow rate detected by flow
en
L9
sensor or flow switch (flow switches 1, 2, 3)
LA
Pressure sensor failure
Boiler circulation water temperature overheat
LC
protection
LD
Boiler temperature thermistor (THWB1) failure
LE
Boiler operation error
LF
Flow sensor failure
LH
Boiler circulation water freeze protection
DHW operation error (type of external plate
LJ
HEX)
Setting errors of DIP switches on FTC control
LL
board
LP
Out of water flow rate range
Communication failure between FTC and wire-
J0
less receiver
P1
Thermistor (Room temp.) (TH1) failure
P2
Thermistor (Ref. liquid temp.) (TH2) failure
P6
Anti-freeze protection of plate heat exchanger
Communication failure between wireless receiv-
J1 - J8
er and wireless remote controller
Communication failure between main remote
E0 - E5
controller and FTC
E6 - EF Communication failure between FTC and C.B.
E9
C.B. receives no signal from FTC.
U*, F* Refrigerant or ambient loop failure
Note: To cancel error codes please switch system off (Press button F4(RESET) on main remote controller, for 3 seconds).
47
Action
Flow rate may be reduced. Check for;
• Water leakage
• Strainer blockage
• Water circulation pump function (Error code may display during filling of
primary circuit, complete filling and reset error code.)
Check the immersion heater and it's contactor.
Check resistance across the thermistor.
See Action for L3.
Check and re-attach any thermistors that have become dislodged.
See Action for L3. If the flow sensor or flow switch itself does not work, re-
place it.
Caution: The pump valves may be hot, please take care.
1. Connector/terminal wire has be-
come detached or loose wiring.
2. Pressure sensor fault
3. FTC board failure
Check if the setting temperature of the Boiler for heating exceeds the re-
striction. (See the manual of the thermistors "PAC-TH012HT-E")
Flow rate of the heating circuit from the boiler may be reduced.
Check for
• water leakage,
• strainer blockage
• water circulation pump function.
Check resistance across the thermistor.
See Action for L8. Check the status of the boiler.
Check flow sensor cable for damage or loose connections.
Flow rate of the heating circuit from the boiler may be reduced.
Check for
• water leakage
• strainer blockage
• water circulation pump function.
• Check for disconnection of DHW tank water temp. thermistor (THW5B).
• Flow rate of the sanitary circuit may be reduced.
• Check for water circulation pump function.
For boiler operation, check that DIP SW1-1 is set to ON (With Boiler) and
DIP SW2-6 is set to ON (With Mixing Tank).
For 2-zone temperature control, check DIP SW2-7 is set to ON (2-zone)
and DIP SW2-6 is set to ON (With Mixing Tank).
Check the installation Table 4.3.1
Check remote controller settings (Service menu / heat pump flow rate
range)
See Action for L3.
Check connection cable for damage or loose connections.
Check resistance across the thermistor.
Check resistance across the thermistor.
See Action for L3.
Check for correct amount of refrigerant.
Check wireless remote controller's battery is not flat.
Check the pairing between wireless receiver to wireless remote controller.
Test the wireless communication. (See the manual of wireless system)
Check connection cable for damage or loose connections.
Check connection cable for damage or loose connections.
Refer to service handbook.
Check connection cable for damage or loose connections. Refer to service
handbook.
Refer to Error Codes (C.B.) or service handbook.
1. Check pressure sensor cable for
damage or loose connections.
2. Electrically test to determine fault.
3. Replace board.
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