Mitsubishi Electric PAC-IF051B-E Installation Manual page 52

. Troubleshooting
No. Fault symptom
4. LED2 on FTC4 (Master) <FTC4 (Master) powered on independent source>
is off.
1. FTC4 (Master) is not supplied with 220 to
(See Figure <4.5.1>)
240V AC.
2. There are problems in the method of
connecting the connectors.
3. FTC4 (Master) failure.
When LED1 on FTC4 (Master) is lit.
Incorrect setting of refrigerant address for
outdoor unit.
(None of the refrigerant address is set to "0".)
5 LED2 on FTC4 When LED1 is also blinking on FTC4 (Master).
(Master) is blinking.
Faulty wiring between FTC4 (Master) and
(See Figure <4.5.1>)
outdoor unit
When LED1 on FTC4 (Master) is lit.
1. Faulty wiring in main controller
Multiple indoor units have been wired to a
single outdoor unit.
2. Short-circuited wiring in main controller
3. Main controller failure
6 LED4 on FTC4 1. SD memory card is NOT inserted into the
(Master) is off. memory card slot with correct orientation.
(See figure <4.5.1>)
2. Not an SD standards compliant memory card.
LED4 on FTC4 1. Full of data.
(Master) is blinking.
2. Write-protected.
(See Figure <4.5.1>)
3. NOT formatted.
4. Formatted in NTFS file system.
7 No water at hot tap. 1. Cold main off
2. Strainer (field supply) blocked.
8 Cold water at tap. 1. Hot water run out.
2. Prohibit, schedule timer or holiday mode se-
lected.
3. Heat pump not working.
4. Booster heater cut-out tripped.
5. The earth leakage circuit breaker for booster
heater breaker (ECB1) tripped.
6. The booster heater thermal cut-out has
tripped and cannot be reset using the manual
reset button.
7. Immersion heater cut-out tripped.
8. Immersion heater breaker (ECB2) tripped.
9. 3-way valve fault
52
Possible cause
1. Check the voltage across the L and N terminals on the indoor power supply
2.
3. Check the FTC4 (Master) control board.
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.)
Check for faulty wiring between FTC4 (Master) and outdoor unit.
1. Check for faulty wiring in main controller.
2.,3. Remove main controller wires and check LED2 on FTC4 (Master). (See Figure
1. Correctly insert SD memory card in place until a click is heard.
2. Use an SD standards compliant memory card. (Refer to section 4.9.)
1. Move or delete data, or replace SD memory card with a new one.
2. Release the write-protect switch.
3. Refer to "4.9 Using SD memory card".
4. FTC4 is Not compatible with NTFS file system. Use an SD memory card formatted
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 settings and change as appropriate.
3. Check heat pump – consult outdoor unit service manual.
4. Check booster heater thermostat and press reset button if safe.
5. Check the cause and reset if safe.
6. Check resistance across the thermal cut-out, if open then the connection is broken
7. Check immersion heater thermostat and press reset button, located on immersion
8. Check the cause and reset if safe.
9. Check plumbing/wiring to 3-way valve.
Explanation - Solution
terminal block. (See section 4.1.)
• When the voltage is not 220 to 240V AC, check for faulty wiring to power
supply.
• When the voltage is 220 to 240V AC, go to 2. below.
Check for faulty wiring between the connectors.
• When the connectors are wired incorrectly re-wire them correctly referring to
below. (See section 4.1 and a wiring diagram on the control and electrical box
cover.)
L
N
Black
CN01
FTC4 (Master)
powered
S1
Hydrobox
from independent
control board
S2
source
S3
• If no problem found with the wiring, go to 3. below.
• Check the fuse on FTC4 (Master) control board.
• Check for faulty wiring.
• If no problem found with the wiring, the FTC4 (Master) control board is faulty.
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.
4.5.1.)
• If LED2 is blinking check for short circuits in the main controller wiring .
• If LED2 is lit, wire the main controller again and:
- if LED2 is blinking, the main controller is faulty;
- if LED2 is lit, faulty wiring of the main controller has been corrected.
in FAT file system.
Reset button is located on the side of booster heater, covered with white rubber
cap. See component parts diagram (Installation manual of Hydrobox, section 3.) to
find out its position.
and the booster heater will have to be replaced.
Contact your Mitsubishi Electric dealer.
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.
(i) Manually override 3-way valve using the main controller. (Refer to <Manual op-
eration> in section 7.2.) If the valve does not still function, go to (ii) below.
(ii) Replace 3-way valve coil. If the valve does not still function, go to (iii) below.
(iii) Replace 3-way valve. (Refer to the service manual.)