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Error code
Title and display conditions
L9
Low primary circuit (Zone2 side) fl ow rate
detected by fl ow switch
* "3" is displayed in "Request code: 569" in "Run-
ning information".
LC
Boiler circulation water temperature overheat
protection
<DHW/Heating/LP/FS/OS>
Error code displayed when THWB1 detects
a temp. ≥80ºC for 10 consecutive seconds or
THWB2 detects a temp. ≥80ºC for 10 consecu-
tive seconds
LD
Boiler temperature thermistor (THWB1, THWB2)
failure
LE
Boiler operation error
<Heating>
Boiler is running and THW6 detects a
temperature <30ºC for consecutive 60 minutes.
LH
Boiler circulation water freeze protection
LL
Setting errors of Dip switches on FTC4 control
board
P1
Indoor unit temperature thermistor (TH1A/TH1B)
failure
P2
Indoor unit temperature thermistor (TH2) failure
P6
Anti-freeze protection of plate heat exchanger
<Cooling>
The error code displayed when Ref. liquid temp.
(TH2) stays at -5ºC or lower for 10 seconds after
compressor operates for 6 minutes.
OCH532A
Possible Cause
1.
Insuffi cient system head
2.
Reduced fl ow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insuffi cient air purge,
blocked strainer, leak in water circuit.
3.
Terminal wire has become detached
or loose wiring.
4.
Flow switch fault
5.
Incorrect setting of the SW3-3
6.
FTC4 board failure
1. The set temperature for Boiler is too
high.
2. Flow rate of the heating circuit from the
boiler may be reduced.
Refer to error codes (P1/P2/L5/LD).
1.
THW6 has become detached from its
holder.
2. Incorrect wiring between FTC4
(OUT10) and the boiler.
3. Boiler fuel has run out or the system is
OFF.
4. Boiler failure
5. FTC4 board failure
Flow rate of the heating circuit from the
boiler may be reduced.
Incorrect setting of Dip switches.
1. Boiler operation
2. 2-zone temperature control
3. Multiple outdoor units control
Refer to error codes (P1/P2/L5/LD).
Refer to error codes (P1/P2/L5/LD).
<Cooling>
1. Reduced water fl ow
• Clogged fi lter
• Leakage of water
2.
Low temperature
• Low load
• Inlet water is too cold.
3.
Defective water pump
4.
Defective outdoor fan control.
5.
Overcharge of refrigerant
6.
Defective refrigerant circuit (clogs)
7.
Malfunction of linear expansion valve
55
Diagnosis and action
1.
If more head required either add an pump
of the same size or replace existing pump.
2.
Check circulation pump (See 10-6. for how
to check).
Open purge valve to remove trapped air.
Check the strainer for blockages.
Check the primary water circuit for leaks.
Check that the flow amount is within the
recommended range.
3.
Visually check the IN7 terminal and reat-
tach if necessary.
4.
Electrically test to determine fault.
5.
Check the SW3-3 setting.
6.
Replace board.
1. Check if the set temperature for Boiler
for heating exceeds the restriction. (See
the manual for the thermistors "PAC-
TH011HT-E")
2. Check for
•
water leakage
•
strainer blockage
•
water circulation pump function.
1.
Visually inspect location and reattach as
necessary.
2. See the manual of the thermistors "PAC-
TH011HT-E".
3. Check the status of the boiler.
4. Check the status of the boiler.
5. Replace board.
Check for
•
water leakage
•
strainer blockage
•
water circulation pump function.
1. 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).
2. 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).
3. For multiple outdoor units control, check Dip
SW1-3 is set to ON on FTC (slave) that runs
DHW operation .
1., 2. Check water piping.
3. Check water pump.
4. Check outdoor fan motor.
5., 6. Check operating condition of refrigerant circuit.
7. Check linear expansion valve.
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Troubleshooting
