Why is my aircon not turning on?
It can be frustrating to find out that your air conditioner suddenly won’t turn on, and it is in the middle of a hot day. Read on and find out the possible reasons for your aircon not turning on as well as the solutions to the issue.
Some brands are more affected by this issue. There are specific model types that are known to fail more constantly than the others. Mitsubishi air conditioners have the most reported cases of spoilt parts. But this could also be due to the widespread use and popularity of Mitsubishi air conditioning units in Singapore.
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Defective indoor aircon PCB
In a multi-split air conditioning system where the condenser connects to several indoor units, the failure of one indoor unit to turn on precisely identifies the issue as a malfunction in the PCB of that indoor AC unit. If you can manually turn on the unit, the problem lies not in the indoor PCB but in the indoor sensor malfunctioning.
Indoor sensor malfunction
If one of the indoor units in a multi-split air conditioning system can be turned on manually but not with a remote control, then the fix is quick, easy, and inexpensive. Simply replace the faulty sensor receiver that won’t respond to the signal from the remote control.
Broken wire
If the aircon fails to turn on manually or via the power button on the remote control, the wiring connecting the fan coil unit to the condenser likely has an issue. Replacing this wiring can be challenging in a condo or landed property when the wiring system runs through a false ceiling. Fixing the wiring requires cutting through the false ceiling, which is both costly and time-consuming.
Outdoor PCB malfunction
This failure is rare, but it can happen. The outdoor PCB is a motherboard that has and is connected to many components; and in the case of one indoor unit in a multi-split aircon system not turning on, the malfunction is somewhere in the wire connected to the indoor unit.
Broken isolator wire
An electrical conductivity problem caused by a broken isolator wire may be the reason for an aircon not turning on. Power cannot be relayed to the indoor unit, so all the indoor units in a multi-split system will not turn on.
Faulty MCB to aircon isolator wire
This is the hardest cause of the aircon-not-turning-on issue to fix. This entails replacing the wiring from the isolator wire to the MCB (Miniature Circuit Breaker) in your DB box. And if the wiring is concealed within the wall, replacing the wire is immensely difficult because of the lack of access.
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Replace the faulty indoor aircon PCB or sensor receiver
If one indoor unit in a multi-split aircon system fails to turn on, there is a 90% likelihood of these aircon spare parts being faulty. The cost of replacing them starts at $120, depending on the rarity of the aircon model and whether or not the replacement parts are new or refurbished.
Change the indoor isolator wire
The cost of replacing a faulty aircon isolator wire is below $150. The bulk of the cost is in the expertise and skilled labor necessary to diagnose a malfunctioning isolator wire.
Replace the defective outdoor aircon PCB
This is also an expensive problem to fix, especially if the defect is in the compressor itself–which is rare. There are several PCBs in the circuit box inside the condenser. The control board is the likeliest to be replaced, except in the case of a defective power board. The cost estimate depends on the aircon model and workmanship needed.
Replace the defective outdoor aircon PCB
If the defect is in the compressor itself–which is thankfully rare. There are several PCBs in the circuit box inside the condenser. The control board is the likeliest to be replaced, except in the case of a defective power board. The cost estimate depends on the aircon model.
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All in all, if your aircon keeps failing to turn on, just follow the suggestions provided. Alternatively, contact us over Whatsapp. We can quickly send over a professional service technician and give you a quote on the cost of aircon repair.
