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. Troubleshooting
<Troubleshooting by inferior phenomena>
No.
Fault symptom
1
Remote controller
1.
display is blank.
2.
2
"Please Wait" remains
1.
displayed on the remote
2.
controller.
3.
3
The main screen
The remote controller operations do not work for a
appears with a press
whilst after the settings are changed in the service
of the "ON" button, but
menu. This is because the system takes time to
disappears in a second.
apply the changes.
4
LED2 on FTC2B is off.
When LED1 on FTC2B is also off.
<FTC2B powered via outdoor unit.>
1.
2.
3.
4.
When LED1 on FTC2B is lit.
5
LED2 on FTC2B is
When LED1 is also blinking on FTC2B.
blinking.
When LED1 on FTC2B is lit.
1.
2.
3.
6
No water at hot tap.
1.
2.
7
Cold water at tap.
1.
2.
3.
4.
5.
6.
7.
30
Possible cause
There is no power supply to remote controller. 1. Check LED2 on FTC2B.
Power is supplied to remote controller,
however, the display on the remote controller
does not appear.
"Please Wait" is displayed for up to 6 minutes. 1.
Communication failure between the remote
controller and FTC2B
Communication failure between FTC2B and
outdoor unit
The outdoor unit is not supplied at the rated
voltage.
Defective outdoor controller circuit board
FTC2B is not supplied with 220 to 240V AC.
FTC2B failure
Incorrect setting of refrigerant address for
outdoor unit
(None of the refrigerant address is set to "0".)
Faulty wiring between FTC2B and outdoor unit
Faulty wiring in remote controller
Multiple indoor units have been wired to a
single outdoor unit.
Short-circuited wiring in remote controller
Remote controller failure
Cold main off.
Strainer blocked.
Hot water run out.
Heat pump not working.
Booster heater cut-out tripped.
The earth leakage circuit breaker for booster
heater breaker (ECB1) tripped.
Immersion heater cut-out tripped.
Immersion heater breaker (ECB2) tripped.
3-way valve fault
Explanation - Solution
(i) When LED2 is lit.
Check for damage or contact failure of the remote controller wiring.
(ii) When LED2 is blinking.
Refer to No. 5 below.
(iii) When LED2 is not lit.
Refer to No. 4 below.
2.
Check the following:
• Disconnection between the remote controller cable and the FTC2B control
board
• Failure of the remote controller if "Please Wait" is not displayed
• Refer to No. 2 below if "Please Wait" is displayed.
Normal operation
2, 3. Go to "Remote controller check" pressing BACK button for 5 seconds (Refer to
page 28).
If "OK" is displayed, conduct the procedures below.
• Check the wiring connections on the outdoor unit control board and the
FTC2B control board.
(Ensure S1 and S2 are not cross-wired and S3 is securely wired with no damage.
• Replace the outdoor unit and/or the FTC2B control board.
If the messages other than "OK" is displayed, see "Remote controller check" on
page 28.
Normal operation
The indoor unit is applying updated settings made in the service menu. Normal
operation will start shortly.
1. Check the voltage across the terminals L and N or L3 and N on the outdoor
power board.
• When the voltage is not 220 to 240V AC, check wiring of the outdoor unit and
of the breaker.
• When the voltage is at 220 to 240V AC, go to "2." below.
2. Check the voltage across the outdoor unit terminals S1 and S2.
• When the voltage is not 220 to 240V AC, check the fuse on the outdoor control
board and check for faulty wiring.
• When the voltage is 220 to 240V AC, go to "3." below.
3. Check the voltage across the indoor unit terminals S1 and S2.
• When the voltage is not 220 to 240V AC, check FTC2B - outdoor unit wiring
for faults.
• When the voltage is 220 to 240V AC, go to "4." below.
4. Check the FTC2B control board.
• Check the fuse on FTC2B control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC2B control board is faulty.
Recheck the refrigerant address setting on the outdoor unit.
Set the refrigerant address to "0".
(Set refrigerant address using Dip switch on outdoor controller circuit board.)
Check for faulty wiring between FTC2B and outdoor unit.
1. Check for faulty wiring in remote controller.
The number of indoor units that can be wired to a single outdoor unit is one. Ad-
ditional indoor units must be wired individually to a single outdoor unit.
2.,3. Remove remote controller wires and check LED2 on FTC2B.
• If LED2 is blinking, check for short circuits in the remote controller wiring .
• If LED2 is lit, wire the remote controller again and:
- if LED2 is blinking, the remote controller is faulty;
- if LED2 is lit, faulty wiring of the remote controller has been corrected.
1. Check and open stop cock.
2. Isolate water supply and clean strainer.
1. Ensure DHW mode is operating and wait for DHW tank to re-heat.
2. Check heat pump – consult outdoor unit service manual.
3. Check booster heater thermostat and press reset button if safe.
If the heater has been operated with no water inside it may have failed, so
please replace it with a new one.
4. Check the cause and reset if safe.
5. Check immersion heater thermostat and press reset button, located on immer-
sion 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 and reset if safe.
7. Check plumbing/wiring to 3-way valve.
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