Air Source Heat Pump Repair in Rotherham and Barnsley: Get Reliable Heat Restored

First — is it actually a fault?

Before you book anything, it's worth knowing what normal winter behaviour looks like, because we get calls every week about things that aren't faults at all.

Frost on the outdoor unit is normal. Heat pumps pull heat from outside air, and in cold, damp conditions that process frosts the coil. The unit runs a defrost cycle to clear it, briefly reversing before switching back to heating. You might see steam rising off the unit or a short dip in output. That's the system working, not failing.

We're in the Dearne valley, which is low-lying and damp, so outdoor units around here pick up frost faster than they would on higher, drier ground. It happens a lot through January and February.

Longer run times in winter are normal too. The colder the air outside, the harder the unit works to hit your target temperature, so it runs longer. That's physics, not failure.

• Frost that melts within 20 to 30 minutes during a defrost cycle — no action needed
• Longer daily run times on sub-zero days compared with milder ones
• A brief drop in output right as defrost kicks in, then normal service resumes
• Airflow blocked by leaves, bins or a fence panel too close — clear a gap and give it room

When it is a fault: ice that builds up and never clears, ice spreading up the pipework rather than sitting on the coil, a unit running constantly with no let-up even on a mild afternoon, or a compressor labouring and cycling in short bursts. A stuck defrost cycle points to a faulty valve or low refrigerant charge, not the weather.

Signs you need a repair rather than a service

You don't need to be an engineer to spot trouble. Most homeowners notice it through sound first — a grinding or clicking noise from the outdoor unit is never normal.

• Grinding, clicking or a new rattle from the outdoor unit
• Ice that doesn't clear after the defrost cycle, or spreads up the pipework
• The unit short cycles, switching on and off every few minutes
• It's tripped the electrics more than once
• Water pooling near the outdoor unit or the indoor cylinder
• The house won't hold heat even after checking airflow and settings

It usually comes down to one of two things: a refrigerant issue or a fault in the defrost cycle. We hear about this most after a hard frost.

If the only symptom is a bill that's crept up over months, that's more likely a service overdue than a fault — our heat pump service page covers that.

Why this isn't a DIY job, or a general handyman job

An air source heat pump isn't a boiler with a fan bolted on. It's a sealed refrigerant circuit wired into your home's electrical supply, and both sides carry real risk if handled wrong.

The refrigerant runs under pressure. Crack a fitting without the right gauges and recovery kit and you're not just wasting gas, you're releasing something that shouldn't be vented into the air. F-Gas handling regulations exist for a reason, and we're F-Gas certified — that's not optional for this work.

Then there's the electrical side. Heat pumps draw on dedicated circuits, often with isolators, RCDs, and sometimes a separate consumer unit connection depending on how the system was installed. Get the wiring wrong and you risk tripping the whole house, or worse.

• Refrigerant leaks need proper detection equipment, not guesswork
• Compressor faults often show electrical symptoms before mechanical ones
• Isolator switches and RCD protection must be checked, not assumed safe
• Outdoor unit corrosion can hide wiring damage until load increases

If you're not confident opening the outdoor casing, don't.

What a repair costs

Diagnosis and repair is £240 including VAT at standard rate and £264 in Band A, covering the first hour, then charged in 15-minute increments. Same-day attendance adds £30 where we can fit you in, as does a set appointment time instead of a 4-hour slot (8am to 12pm, 10am to 2pm or 12pm to 4pm).

Parts are quoted separately once we know what's actually wrong, and we tell you the figure before ordering anything. Refrigerant, if the system needs recharging, is quoted separately too.

We don't charge a diagnostic fee on top of the repair rate — the first hour covers finding the fault, and if we can fix it inside that hour, that's what you pay.

Check which band your postcode falls into on our rates page.

What happens on a repair visit

Our engineers work Monday to Friday, 8am to 4pm. Ring during office hours and we'll do our best to get to you the same day; otherwise it's first thing the next working day. We don't offer out-of-hours or emergency callouts.

• We listen to your description of the fault and check the system history
• Inspect the outdoor unit for ice buildup, fan issues or blocked airflow
• Test refrigerant pressures, electrical readings and control settings
• Explain what's wrong in plain terms before any work starts
• Carry out the repair and run the system to confirm it's holding heat

We won't start swapping parts on a hunch. Checking flow temperatures and system pressures first is what stops you paying twice — once for the wrong fix, then again for the right one.

Some faults are sorted in under an hour. Others need a part ordered, and we'll tell you straight away which one you're dealing with.

Before we leave, we run the heat pump through a full cycle. We want to see it heating properly, not just switching on.