Toshiba aircon PCB repair in Singapore
A Toshiba board code says which circuit reported the fault, not whether the board itself has failed. We test the indoor PCB, outdoor PCB and inverter or driver stage separately, explain what failed and quote after diagnosis.
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Signs your Toshiba aircon needs a PCB check
These symptoms can involve a control board, but they can also come from wiring, a sensor or another part connected to the board.
The unit has power but will not start
Lights or the controller may still respond while the indoor unit, outdoor unit or both refuse to run normally.One room or the whole system stops responding
The pattern across rooms helps separate an indoor-board problem from an outdoor or shared communication fault.A communication or board-related error appears
A Toshiba code, blinking light or repeated restart gives us a useful starting point, but it still needs electrical testing.
Examples of Toshiba systems we check
RAS residential split systems
RAS Daiseikai inverter systems
RAS-M residential multi-split and Carrier-Toshiba systems, with scope confirmed from the exact model
Model not listed
Send photos of the indoor and outdoor model labels, plus the error code or a short video of the symptom.
A board-related code does not always mean a failed PCB
Before ordering model-specific electronics, we check three problems that can make a healthy board appear faulty.
Power or wiring fault
Loose terminals, a damaged interconnect or unstable supply can produce board and communication errors.Sensor or connected load
A shorted thermistor, motor or valve can pull down a healthy board or make its input look incorrect.Inverter power stage
On inverter systems, the main control PCB and the IPM or driver circuit are tested as separate failure points.
We check the power supply, communication wiring, sensors, connected loads, indoor and outdoor boards, and inverter drive where fitted. How a job runs, from first message to booking.
What is different on Toshiba systems
Toshiba inverter-board faults become more common with age and voltage stress. We confirm the exact board revision before committing to sourcing.
Toshiba error codes related to PCB problems
Open the group that matches where the code appeared on your unit.
Indoor unit or controller13 guides
- C05Central controller transmission fault; Central controller send fault
- C06Central controller reception fault; Central controller receive fault
- E01Remote controller cannot receive signals from the indoor unit; Remote controller cannot receive a response from the header indoor unit
- E02Remote controller cannot transmit signals to the indoor unit; Remote controller cannot send to the indoor unit
- E03Indoor unit lost communication from the remote controller or network adaptor; Indoor unit has lost regular communication from the remote controller or network adapter
- E04Indoor unit is not receiving signals from the outdoor unit; Indoor/outdoor serial communication error
- E10Indoor main-controller to motor-microcontroller communication fault; Communication error between the indoor main MCU and fan-drive MCU
- E11Application control kit to indoor PCB communication fault
- E17Communication trouble between indoor units and the flow-selector unit
- E18Indoor header and follower units lost periodic communication; Periodic communication error between the indoor header and follower units
- F29Indoor PCB, EEPROM, or air-suction temperature sensor fault; Indoor EEPROM fault
- P30Indoor group follower-unit fault reported by the central controller
- S01Central controller cannot receive signals
Outdoor unit7 guides
- E07Outdoor unit cannot transmit signals to indoor units
- E23Outdoor unit cannot transmit signals to another outdoor unit
- E28Outdoor header unit detected a follower outdoor-unit fault
- E31Communication fault between inverter-box PCBs
- F31Outdoor EEPROM fault
- L29Outdoor PCB MCU communication or board fault
- L31Outdoor interface PCB extended-IC fault
Inverter and power electronics2 guides
Whole-system faults4 guides
Codes that depend on the exact model5 guides
- 04Serial signal or connecting-cable fault between indoor and outdoor units; Serial signal error
- 07Outdoor return signal stopped after operation started; possible power, protector, refrigerant, pressure, or signal-circuit issue
- 12Other trouble on the indoor PCB
- 17Current-detect circuit error on the inverter PCB
- 41UART communication error between RAC interface and RAC
Codes can mean different things across model and system families. Every code is in the full lookup for this brand. Last reviewed 2026-08-21.
Is Toshiba PCB repair worth it?
Parts and timing
Toshiba sourcing can run through Carrier's supply chain. Exact suffixes matter because older Toshiba and newer Carrier-Toshiba boards are not assumed interchangeable.Our recommendation
PCB repair is usually sensible when the rest of the system is healthy, the exact board revision is available and testing has ruled out wiring, sensors and connected loads. Toshiba systems commonly have a service life of 8–12 years. For a system over 10 years, major component failures generally favour replacement. Parts availability is the deciding factor ; if the specific board or compressor is still sourceable within a reasonable timeframe, repair may still make sense.
If replacement makes more sense, we compare the repair quote with a suitable new system. See our aircon system replacement process.
Other Toshiba repair checks
If testing rules out this part, these are the next checks on the same system.
Workmanship warranty
We stand behind the repair we carry out, and we are straight about the part of the cover we do not set ourselves.
Labour
30-day workmanship warranty. If the same fault returns from our repair, we come back and the labour is on us, with no second diagnostic visit fee.
Parts
Parts carry the distributor's warranty for that component, so the term varies by part. We tell you both terms before you approve the work.
Frequently asked questions about Toshiba PCB repair in Singapore
What are the signs of a Toshiba PCB problem?
How do you confirm a Toshiba PCB fault?
Is a Toshiba error code enough to order the PCB?
Should I repair or replace my Toshiba aircon?
We cover all of Singapore. Find aircon services in your area.
Describe your situation
Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.