Why is my heat-pump dryer tripping the breaker?#
The most likely reason a heat-pump dryer trips the breaker is an overloaded or shared circuit: the dryer draws a surge when its compressor starts, and if that circuit also feeds other loads, the combined draw tips the breaker. Because the compressor's start-up surge is the moment of highest demand, a trip that happens right as the machine tries to start points to the circuit, the compressor, or moisture. The table below lists the causes — an overloaded or shared circuit, a failing compressor or start device, moisture in the wiring or plug, and a damaged mains lead. The tell-tale is the breaker or plug tripping soon after the compressor tries to start, rather than randomly when the machine is idle.
Tripping the breaker: likely causes, ranked#
A heat-pump dryer draws a start-up surge from its compressor, so a trip points to the circuit, the compressor, or moisture. You will find the breaker or plug tripping soon after the compressor tries to start.
| Likely cause | What's happening | How likely | First thing to check | Fix it yourself? |
|---|---|---|---|---|
| An overloaded or shared circuit | the compressor start-up draw trips a circuit that is shared or undersized | Most likely | run the dryer on its own correctly rated circuit, not an extension lead | Often DIY |
| A failing compressor or start device | a compressor drawing too much current on start trips the breaker | Possible | a technician tests the compressor and its start relay or capacitor | Pro repair |
| Moisture in the wiring or plug | damp in the connections causes a leakage trip, especially on an RCD | Possible | a technician dries and checks the wiring — do not keep resetting a tripping RCD | Pro repair |
| A damaged mains lead | a nicked or pinched cord shorts and trips the supply | Less likely | an electrician inspects and replaces a damaged mains lead | Pro repair |
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Safe checks to try first#
Approach this carefully, because a tripping breaker is doing its safety job and some causes are electrical. First, address load: make sure the dryer is on its own adequately rated circuit and not sharing with other high-draw appliances, and move it to a dedicated outlet if it is on a shared one. Second, look for moisture: a damp plug, a wet outlet, or condensation around the connection can cause a trip, so dry the plug and outlet thoroughly and make sure the area is not wet. Third, inspect the mains lead for obvious damage — a cut, crushed, or scorched cable should take the machine out of use immediately. What you should not do is open the machine to probe the compressor or internal wiring. If the breaker keeps tripping after the dryer is on a proper dedicated circuit with a dry, sound plug and an undamaged lead, stop using it and call a technician, and involve a licensed electrician if you suspect the circuit or wiring in the wall.
When to call a technician#
The owner side is limited to the safe electrical basics: a dedicated, adequately rated circuit, a dry and sound plug and outlet, and an undamaged mains lead. What needs a technician is a trip that continues once those are right, because it points inside the machine — a failing compressor or its start device drawing excess current, or moisture and faults in the internal wiring. Those are diagnosed and repaired by a technician, not the owner. And where the trip involves the household circuit or wiring rather than the appliance, a licensed electrician should check the circuit. A dryer that trips the breaker on a proven-good dedicated circuit is drawing too much current internally, which is both a repair and a safety matter, so it should be left off until a professional has looked at it.
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Gas dryers carry carbon monoxide and explosion risk. Even electric dryers involve 240V circuits that can deliver a fatal shock. Our techs are licensed and insured — let them handle the risk.
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Common questions#
Why is my heat-pump dryer tripping the breaker?#
Most often the dryer shares an overloaded circuit, and the compressor's start-up surge tips the breaker. A failing compressor or start device, moisture in the plug or wiring, or a damaged mains lead can also cause it. A trip that comes as the compressor starts points to one of these rather than a random fault.
Could an overloaded or shared circuit be the cause?#
Yes, it is the leading cause. If the dryer shares a circuit with other high-draw appliances, the compressor's start-up surge added to the other loads can trip the breaker. Putting the dryer on its own adequately rated dedicated circuit usually resolves it when a shared circuit was the problem.
Does a failing compressor or start device explain it?#
It can. A compressor that is failing, or a faulty start device, can draw excess current as it tries to run, tripping the breaker to protect the circuit. This is internal to the sealed system and is a technician's diagnosis and repair, not something to investigate by opening the machine.
Should I check moisture in the wiring or plug first?#
Check the plug and outlet for moisture early, since it is safe and common. A damp plug, a wet outlet, or condensation at the connection can cause a trip. Dry everything thoroughly and keep the area dry; if trips continue on a dry, sound connection, the cause is deeper and needs professional attention.
Can a damaged mains lead do this?#
Yes. A cut, crushed, or scorched mains lead can short and trip the breaker, and it is a genuine hazard. If the lead is visibly damaged, stop using the dryer immediately and have the lead replaced by a technician or electrician rather than continuing to plug it in.
Is this a DIY fix or a technician job?#
The safe owner steps are a dedicated circuit, a dry sound plug, and an undamaged lead. If the breaker still trips after those, a failing compressor or internal wiring is the likely cause, which is a technician job — and any suspicion of the household circuit itself calls for a licensed electrician.
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