General Guide to Aircon Cannot Turn 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.
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To some extent, some aircon brands are more predisposed to the issue of an AC unit that suddenly won’t turn on. Some models of certain AC brands are known to be outfitted with parts that are more likely to fail and prevent the air conditioning unit from turning on. Mitsubishi air conditioners, and maybe partly because the brand is massively popular in Singapore, have the most reported cases.
6 Reasons why Aircon cannot turn on
Here are the most common reasons for an aircon suddenly not being able to turn on:
Defective indoor Aircon PCB
In a multi-split air conditioning system where the condenser is connected to several indoor units, one indoor unit not being able to turn on precisely narrows down the issue to a malfunction in the PCB of that indoor AC unit. If manually turning on the unit is possible, however, then it is not an indoor PCB problem but a malfunction in the indoor sensor.
Indoor Sensor Malfunctioning
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 won’t turn on manually or through the power button on the remote control, then there is likely an issue with the wiring that connects the fan coil unit to the condenser. And this wiring may be difficult to replace in a condo or landed property where the wiring system is usually run through a false ceiling. Replacing the wiring entails cutting through the false ceiling, a costly and time-consuming task.
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 the DB box. And if the wiring is concealed within the wall (which is usually the case in landed properties), replacing the wire is immensely difficult because of the lack of access.
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Replace the faulty indoor 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 AC 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 unique expertise and skilled labor necessary to diagnose a malfunctioning isolator wire.
Replace the defective outdoor aircon PCB
This is also a relatively expensive problem to fix, especially 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.
Change the wiring connecting the fan coil to the condenser
The cost depends on the set-up of your house. Landed properties and condos require a visit just to get a cost estimate.The cost of an HDB flat wiring replacement is the easiest to estimate (possibly not exceeding $280).
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If your are unable to turn on your aircon, fret not as it is usually a problem that is traceable. You may be able to figure out the root cause via some of the methods shown above. However if you are still not sure why your , feel free to WhatsApp us. We will be able to give you an estimated price of repair and send one of our aircon repair specialists to assist you.
