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No.
Fault symptom
When LED1 on FTC3 is also blinking.
5
LED on FTC3 is blink-
ing.
When LED1 on FTC3 is lit.
1. Miswiring of main controller wires
. Miss-setting of refrigerant address for
3. Short-circuit of main controller wires
4. Defective main controller
No water at hot tap.
6
1. Cold main off
. Strainer (field supply) blocked.
Cold water at tap.
1. All hot water used.
7
. Prohibit, schedule timer or holiday mode
3. Heat pump not working.
4. Booster heater cut out has triggered.
5. Booster heater breaker (ECB1) has tripped.
6. The booster heater thermal cut-out has
7. Immersion heater cut out has triggered.
8. Immersion heater breaker (ECB2) has tripped.
9. 3-way valve fault
It takes long for water
1. Heat pump not working.
8
. Booster heater cut out has triggered.
to heat.
3. Booster heater breaker (ECB1) has tripped.
4. The booster heater thermal cut-out has
5. Immersion heater cut out has triggered.
6. Immersion heater breaker (ECB2) has tripped.
The water temperature decreases to a certain
9
Water in tank is not
used, but the water
degree as the tank heat radiates when DHW
or Heating operation is not running. If the
temperature of the tank
temperature decreases excessively and
decreases.
reheating occurs frequently, check for the
following.
1.
.
3.
Hot or warm water from
10
If tap runs cold after a minute or so the pipe is
picking up heat from heating pipe work.
cold tap.
Possible cause
Connection failure of FTC3/outdoor unit
connecting wire
Multiple indoor units have been wired to 1
outdoor unit.
outdoor unit
(Outdoor unit refrigerant address should be
set to "0")
selected.
operated and can not be reset using the
manual reset button.
operated and can not be reset using the
manual reset button.
Water leakage through the pipes that
connect to the tank
Peeling off of insulation
3-way valve fault
Explanation - Solution
Check FTC3/outdoor unit connecting wire for connection failure.
Check the connection of main controller wires.
1.
Only 1 indoor unit should be wired to 1 outdoor unit.
Supplementary indoor units should each be wired to a separate outdoor unit.
Recheck the refrigerant address setting on the outdoor unit.
.
Set the refrigerant address to "0".
(Set refrigerant address using SW1(3~6) on outdoor controller
circuit board.)
3, 4.
Remove main controller wires and check LED2 on FTC3.
• If LED2 is blinking check the main controller wires are not short circuiting.
• If LED2 is lit, connect main controller wires again and:
- if LED2 is blinking, main controller is defective;
- if LED is lit, connection failure of main controller terminal block etc. has
returned to normal.
1.
Check and open stop cock.
Isolate water supply and clean strainer.
.
Ensure DHW mode is operating and wait for tank to re-heat.
1.
Check settings and change as appropriate.
.
Check heat pump – consult outdoor unit service manual.
3.
4.
Check booster heater thermostat and press reset button if safe.
Reset button is covered with white rubber cap see component parts diagram
section 10-6. for position.
5.
Check the cause of the trip and reset if safe.
6.
Check the resistance of the thermal cut out, if open then the connection is
broken and the booster heater will have to be replaced.
Please contact your Mitsubishi Electric dealer.
7.
Check immersion heater thermostat and press reset button,
located on immersion heater boss, if safe. If the heater has been operated
with no water inside it may have failed, so please replace it with a new one.
8.
Check the cause of the trip and reset if safe.
Check plumbing/wiring to 3-way valve.
9.
(i) Operate 3-way valve manually using the main remote controller. (Refer to
<Manual operation> in 9.2).
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve. (Refer to Procedure 6 in "11. DISASSEMBLY
PROCEDURE."
Check heat pump – consult outdoor unit service manual.
1.
.
Check booster heater thermostat and press reset button if safe.
Reset button is covered with white rubber cap see component parts diagram
section 10-6. for position.
3.
Check the cause of the trip and reset if safe.
4.
Check the resistance of the thermal cut out, if open then the connection is
broken and the booster heater will have to be replaced.
Please contact your Mitsubishi Electric dealer.
5.
Check immersion heater thermostat and press reset button,
located on immersion heater boss, if safe. If the heater has been operated
with no water inside it may have failed, so please replace it with a new one.
6.
Check the cause of the trip and reset if safe.
Take the following measures.
1.
• Retighten the nuts holding the pipes onto the tank.
• Replace seal materials.
• Replace the pipes.
.
Reattach insulation.
Check plumbing/wiring to 3-way valve.
3.
(i) Operate 3-way valve manually using the main remote controller. (Refer to
<Manual operation> in 9.2).
(ii) Replace 3-way valve coil.
(iii) Replace 3-way valve. (Refer to Procedure 6 in "11. DISASSEMBLY
PROCEDURE."
Insulate/re-route pipe work.
50
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