Mitsubishi Ecodan User Manual

46
Service and Maintenance
7
GB
Error Codes
Code Error Action
L3 Circulation water temperature overheat protection
Flow rate may be reduced check for;
• Water leakage
• Strainer blockage
• Water circulation pump function (Error code may display during lling of
primary circuit, complete lling and reset error code.)
L4 DHW tank water temperature overheat protection Check the immersion heater and it’s contactor.
L5
Indoor unit temperature thermistor (THW1, THW2, THW5, THW6, THW7, THW8,
THW9) failure
Check resistance across the thermistor.
L6 Circulation water freeze protection See Action for L3.
L8 Heating operation error Re-attach any thermistors that have become dislodged.
L9 Low primary circuit ow rate detected by ow switch (ow switches 1, 2, 3)
See Action for L3. If the ow switch itself does not work, replace it.
Caution:
The pump valves may be hot, please take care.
LC Boiler circulation water temperature overheat protection
Check if the setting temperature of the Boiler for heating exceeds the re-
striction. (See the manual of the thermistors "PAC-TH011HT-E")
Flow rate of the heating circuit from the boiler may be reduced. Check for
water leakage,
strainer blockage
water circulation pump function.
•
•
•
LD Boiler temperature thermistor (THWB1, THWB2) failure Check resistance across the thermistor.
LE Boiler operation error See Action for L8. Check the status of the boiler.
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.
•
•
•
LL Setting errors of Dip switches on FTC4 control board
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).
J0 Communication failure between FTC4 and wireless receiver Check connection cable for damage or lose connections.
P1 Thermistor (Room temp.) (TH1) failure Check resistance across the thermistor.
P2 Thermistor (Ref. liquid temp.) (TH2) failure Check resistance across the thermistor.
P6 Anti-freeze protection of plate heat exchanger
See Action for L3.
Check for correct amount of refrigerant.
J1 - J8 Communication failure between wireless receiver and wireless remote controller
Check wireless remote controller’s battery is not at.
Check the pairing between wireless receiver to wireless remote controller.
Test the wireless communication. (See the manual of wireless system)
E0 - E5 Communication failure between main controller and FTC4 Check connection cable for damage or loose connections.
E6 - EF Communication failure between FTC4 and outdoor unit
Check that the outdoor unit has not been turned off.
Check connection cable for damage or loose connections.
Refer to outdoor unit service manual.
E9 Outdoor unit receives no signal from indoor unit.
Check both units are switched on. Check connection cable for damage or
loose connections. Refer to outdoor unit service manual.
U*, F* Outdoor unit failure Refer to outdoor unit service manual.
N
ote: To cancel error codes please switch system off (Press button E, on Main Controller, for 3 secs).

Mitsubishi Ecodan Specifications

General

Brand	Mitsubishi
Model	Ecodan
Category	Heat Pump
Language	English