47
Check code
Title and display conditions
Possible Cause
Diagnosis and action
L9
Low primary circuit (Zone2 side) flow rate
detected by flow switch
Note: “3” is displayed in “Request code: 569” in
“Running information”.
1.
Insufficient system head
1. If more head required either add a pump of
the same size or replace existing pump.
2.
Reduced flow in primary water circuit
Due to 1 or more of the following;
Faulty pump, insufficient air purge,
blocked strainer, leak in water circuit
2.
Check circulation pump (See "10-6. Check
-
ing Component Parts' Function" 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.
Terminal wire has become detached or
loose wiring.
3. Visually check the IN7 terminal and reat-
tach if necessary.
4.
Flow switch fault
4. Electrically test to determine fault.
5. Incorrect setting of the SW3-3
5. Check the SW3-3 setting.
6. FTC board failure
6. Replace board.
LA
Pressure sensor failure
1.
Connector/terminal wire has become
detached or loose wiring.
1. Check pressure sensor cable for damage or
loose connections.
2. Pressure sensor fault
2. Electrically test to determine fault.
See "10-6. Checking Component Parts'
Function" for how to check.
3. FTC board failure
3. Replace board.
LB
High pressure protection
1.
Flow rate of the heating circuit may be
reduced.
1.
Check water circuit.
2. Plate heat exchanger may be clogged. 2. Check the plate heat exchanger.
3. Outdoor unit failure
3. Refer to outdoor unit service manual.
LC
Boiler circulation water temperature overheat
protection
<DHW/Heating/LP/FS/OS>
Check code displayed when THWB1 detects a
temperature ≥80ºC for 10 consecutive seconds
1. The set temperature for Boiler is too
high.
1. Check if the set temperature for Boiler for
heating exceeds the restriction. (See the
manual for the thermistors "PAC-TH011HT-E")
2.
Flow rate of the heating circuit from the
boiler may be reduced.
2. Check for
• water leakage
• strainer blockage
• water circulation pump function
LD
Boiler temperature thermistor (THWB1) failure
Refer to check codes (P1/P2/L5/LD).
LE
Boiler operation error
<Heating>
Boiler is running and THW6 detects a
temperature <30ºC for consecutive 60 minutes.
1. THW6 has become detached from its
holder.
1.
Visually inspect location and reattach as
necessary.
2.
Incorrect wiring between FTC (OUT10)
and the boiler
2.
See the manual of the thermistors "PAC-
TH011HT-E".
3. Boiler fuel has run out or the system is
OFF.
3.
Check the status of the boiler.
4. Boiler failure
4.
Check the status of the boiler.
5. FTC board failure
5.
Replace board.
LF
Flow sensor failure
Disconnection or loose connection of
flow sensor
Check flow sensor cable for damage or
loose connections.
LH
Boiler circulation water freeze protection
Flow rate of the heating circuit from the
boiler may be reduced.
Check for
• water leakage
• strainer blockage
• water circulation pump function
LJ
DHW operation error (type of external plate HEX) 1.
DHW tank water temp. thermistor
(THW5B) has become detached from
its holder.
1.
Check for disconnection of DHW tank water
temp. thermistor (THW5B).
2.
Flow rate of the sanitary circuit may be
reduced.
2.
Check for water circulation pump function.
LL
Setting errors of DIP switches on FTC control
board
Incorrect setting of DIP switches
1. Boiler operation
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. 2-zone temperature control
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. Multiple outdoor units control
3. For multiple outdoor units control, check DIP
SW1-3 is set to ON on FTC (sub) that runs
DHW operation .
P1
Indoor unit temperature thermistor (TH1A/TH1B)
failure
Refer to check codes (P1/P2/L5/LD).
P2
Indoor unit temperature thermistor (TH2) failure
Refer to check codes (P1/P2/L5/LD).
OCH712C
Summary of Contents for ecodan EHPX-VM2D
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