Mitsubishi Heavy Industries Air Conditioning FD error code support
Codes for Mitsubishi Heavy Industries Air Conditioning FDT,
FDTC, FDUM, FDEN, FDUR models
FD Fault codes:
(2) Procedures of trouble diagnosis When any error occurs, inspect in following sequence. Detailed explanation on each step is given later in this text. Error Power supply reset (1) Check of inspection display [In-door/outdoor unit PCB, remote controller or Indication board] Check of inspection display [In-door/outdoor unit PCB, remote controller or Indication board] Power supply check (indoor/outdoor unit) Replacement or repair of defective parts Test run/adjustment Check of unit controller
(3) Error diagnosis procedures at the
indoor unit side To diagnose the
error, measure the voltage (AC, DC), resistance, etc. at each connector
around the circuit board of indoor unit based on the inspection display
or the operation state of unit (no operation of compressor or blower, no
switching of 4-way valve, etc.) If any defective parts are discovered,
replace with the assembly of parts as shown below. (a) Single-unit
replacement parts for circuit board of indoor unit. (Peripheral
electric parts for circuit board.) Indoor unit printed circuit board,
thermistor (return, heat exchanger), operating switches, limit switches,
transformers, fuses. Note (1) Use normal inspection methods to determine
the condition of strong electrical circuits and frozen cycle parts. (b)
Replacement procedure of indoor unit microcomputer printed circuit board
Microcomputer printed circuit board can be replaced with following
procedure. (I) Confirm the parts numbers. (Refer to the following parts
layout drawing for the location of parts number.)
PJA505A122ZD PJA505A122ZC PJA505A128ZF Parts
number FDTA 151~401 FDTA 501, 601 FDE Model FDKA 151~251 FDKA
301 FDUR Model PHA505A018ZF PHA505A018ZG PJA505A131ZC Parts
(4) Error diagnosis procedures at the
outdoor units side
At the error diagnosis related to the
outdoor unit, check at first the error code of remote controller and the
illumination patterns of
norma1 and inspection display lamps in
the same manner as the case of indoor unit.
Then estimate the outline, the cause and
the location of error based on the pattern and proceed to the inspection
Since the self diagnosis function by
means of the microcomputers of indoor/outdoor units provide the
judgement of error of
microcomputers them selves irregularity
power supply line, overload, etc. caused by the installation space,
inadequate volume of
refrigerant etc., the location and cause
of trouble will be discovered without difficulty.
In addition, the display lamps error code
of indoor/outdoor unit is kept flashing, (except when the power supply
is interrupted) after
the irregularity is automatically
recovered to give irregularity information to the service personnel. If
any mode of higher priority
than the error retained in memory occurs
after the reset of error, it is switched to that mode and saved in the
(a) Replacement parts assembly related
to the outdoor unit controller
Outdoor unit PCB, power transistor
module, capacitor, noise filter, thermistor, (heat exchanger, discharge
temperature, power transistor), fuse,
(b) Replacement procedure of outdoor
unit microcomputer printed circuit board.
Microcomputer printed circuit board can
replaced with following procedure.
1) Confirm the parts numbers. (Refer to
the following parts layout drawing for the location of parts number.)
Characteristics of HEAT mode operation
Mechanism and capacity of HEAT mode
• The unit draws in heat from the cold
outside air, transfers it indoors and heats the room. The heating
capacity of the heat pump mechanism decreases
when the outside air temperature gets
• The hot air circulation system takes
a while before warming up the room temperature.
• If the outside temperature becomes
extremely low, it would be better to use an additional source of
If the outside temperature becomes low
and humidity is high, the heat exchanger in the outdoor unit may frost
over, which prevents efficient heating.
If this happens, the automatic
defroster is activated and during defrosting the heating operation stops
for 5 to 10 minutes.
• Both indoor and outdoor fans stop and
the RUN light (green) blinks slowly (1.5 sec. ON, 0.5 sec. OFF) during
• The outdoor unit may give off some
steam during defrosting. This is to help the defrosting process and is
not a defect.
• The HEAT operation resumes as soon as
defrosting has been completed.
Air conditioner operating conditions
Use within the following operational
range. Operating outside of this range may result in the protection
devices being activated, preventing the unit from working.
Outside temperature Approximately 21 to
Below approximately -15 to 21 °C
Below approximately 80%
The long-term use of the unit with a
humidity level Inside humidity exceeding 80% may result in condensation
forming on the — surface of the indoor unit, leading to water drips.
Dependent upon service conditions and
operating environment, the inside of the air conditioner may become
dirty after a number of seasons'
service (3 to 5 years). This will reduce
performance. In addition to normal cleaning, we would recommend
inspection and maintenance. (The air conditioner has a longer life
without any trouble.)
• Contact your dealer, or any
distributor, for inspection and maintenance. (There will be a charge for
• We would recommend inspection and
maintenance to be carried out during the off-season.
• If the supply cord of this appliance
is damaged, it must only be replaced by a repair shop appointed by the
manufacturer, because special purpose tools are required.
Inspecting and replacing the natural
enzyme filter and the photo catalytic washable deodorizing filter
1. Open the air inlet grill and remove
the air filters.
2. Remove the filter holders, with the
natural enzyme filter and the photo catalytic washable
deodorizing filter installed in the
holders, from the air conditioner.
3. Remove the natural enzyme filter from
the filter holder and inspect the filter. Use a vacuum
cleaner to remove any dust or dirt from
the natural enzyme filter. Replace the natural enzyme
filter if it cannot be cleaned or if it
has been used for about 1 year.
(The natural enzyme filter should be
replaced after about 1 year of use. However, the actual
replacement period may vary depending on
the conditions in which the filter is used.)
Remove the photo catalytic washable
deodorizing filter from the filter holder and inspect the
filter. Periodically, remove any dust or
dirt from the photo catalytic washable deodorizing
filter. If the photo catalytic washable
deodorizing filter is particularly dirty, it may be washed
with water. However, the filter is
fragile so be sure to wash it installed in the filter holder to
avoid damaging it. After washing the
filter, place it in sunlight to dry. Placing the filter in
sunlight revitalizes the deodorizing
(Do not dispose of the filter holders.
They are reused.)
4. Install the natural enzyme filter and
the photo catalytic washable deodorizing filter in the filter
holders, and then install the filter
holders in the air conditioner.
5. Install the air filters and close the
air inlet grill.
For replacement natural enzyme filters
and photo catalytic washable deodorizing filters, contact your dealer.
Mitsubishi Heavy Industries Air Conditioning SPARES DELIVERY WORLDWIDE including USA, Europe, Canada, South and central America, Africa, New Zealand, Australia and Asia.
We can ship MHI air conditioning spare and parts including wall, cassette, floor, ducted and multi air conditioning units parts. Please call or email us your unit model number and required part. We will then contact you with the price, availability and shipping cost.
Including fan blades, thermistor probes, compressors, scroll compressor, Inverter compressor, swing compressor, Inverter Pcb, printed circuit boards, air filters, fan motors, thermisters, drain pumps, remote controls, expansion valve, condensor coil, solenoid valve, crankcase heater, electronic thermostat, float switch, magnetic contactor, capacitor, high pressure switch, low pressure switches and PCB's, PWB's.
Orion air conditioning and refrigeration offer an UK installation, service and maintenance on Industrial, commercial refrigeration and air conditioning. Spare parts supply on Bitzer, Copeland, Prescold, Carrier, Carlyle, Dorin, Prescold, Frascold, Gram, Grasso, Hubbard, Maneurop, Trane and Sabroe.
Sales Installation and Service
UK: +44 (0)1234 841221
Orion Air conditioning and refrigeration ltd. All rights reserved @2008
Last updated - 13/02/2020