Broken heat pump? Our certified engineers fix 80% of faults same day with an average 90-minute response. All major brands: Daikin, Mitsubishi, Vaillant and more.
Facing a faulty heat pump in Northampton? Our F-Gas certified engineers fix 80% of common faults same day, restoring your system's efficiency and keeping your home warm. Whether it's a complete loss of heat, unusual noises, persistent error codes, refrigerant leaks, inefficient cycling, or a frozen outdoor unit, we diagnose and repair with precision using genuine parts.
We cover all major brands including Daikin, Mitsubishi, Vaillant, Worcester Bosch, Samsung, LG and more. Our vans are stocked with the most common heat pump parts, compressors, expansion valves, reversing valves and circuit boards, so most jobs are completed in a single visit. Our engineers are local, so response times across Northampton and surrounding NN postcodes average just 90 minutes.
Recognise your fault? Our engineers carry the parts to fix most of these on the first visit.
Ice build-up on the outdoor coil is one of the most common heat pump faults in UK winters. Usually caused by a failed defrost cycle, the heat pump should melt ice automatically. If it doesn't, a sensor, valve or control board fault is preventing it.
Same day in most casesIf your heat pump is running but output is poor, or it's cycling on and off rapidly, a refrigerant gas leak is the most likely cause. All refrigerant work requires F-Gas certification, we carry the equipment to detect, repair and recharge legally.
Same day in most casesA failed circulation pump or flow sensor prevents hot water from moving through the system. The heat pump runs but produces little or no heat. One of the most frequently repaired faults, our vans carry replacement pumps and sensors as standard.
Usually 1 – 2 hoursModern heat pumps display fault codes on their controller, common examples include E1, F4, A0, H6 (varies by brand). These codes pinpoint the fault precisely. Photograph your code before calling, it helps us arrive with the right parts.
Diagnosed on same visitUnusual sounds — grinding, rattling, squealing, indicate mechanical wear in the fan motor, compressor, or circulation pump. Caught early, these are straightforward repairs. Left too long, they can lead to compressor failure — a significantly more expensive fix.
Diagnosed same visitA heat pump working harder than it should, reflected in rising electricity bills, often points to dirty coils, a refrigerant undercharge, or a failing compressor. An annual service typically identifies and resolves this before it becomes a breakdown.
Often resolved by serviceBased in Northamptonshire, our engineers know the region's climate challenges — from damp winters to unpredictable frosts, and tailor repairs to keep your system running smoothly year round. No long travel delays, no inflated call-out fees.
Each van carries a comprehensive range of spare parts, compressors, expansion valves, reversing valves, common circuit boards. This enables most repairs to be completed in a single visit, saving you time and a second call-out fee.
Before any work begins, you receive a clear itemised quote, no hidden fees, no surprises. The diagnostic fee is credited toward the repair if you proceed. We only recommend what's genuinely needed.
Don't see your brand? Call us — if it's a heat pump, we'll most likely be able to help.
Regular servicing is the most effective way to prevent costly heat pump breakdowns. An annual service catches small problems before they become expensive faults — and it typically improves your system's efficiency, reducing electricity bills in the process.
Our fixed-price annual heat pump service covers everything needed to keep your system running at peak performance. Customers enrolled in our service plan also receive priority same-day repair slots whenever urgent help is needed — no waiting behind the general queue.
Refrigerant leak check — full system pressure test to confirm no refrigerant loss
Coil cleaning — professional clean of outdoor and indoor coils to restore heat exchange efficiency
Filter inspection & replacement — dirty filters reduce airflow and efficiency
Electrical connection check — inspect terminals and connections for corrosion or looseness
Flow and return temperature test — verify the system is hitting target temperatures
Defrost cycle check — confirm the automatic defrost is functioning correctly
Written system health report — clear summary of condition, any recommendations, and next service date
Regular servicing prevents 80% of breakdowns — and keeps your heat pump running at its rated efficiency, which typically means lower electricity bills month on month.
Fixed-price, written report included. Available across all NN postcodes.
Frequently asked questions about heat pump repair and servicing in Northampton.
We fix 80% of heat pump faults same-day with an average response time of 90 minutes for urgent call-outs across Northampton and all NN postcodes. Our vans are stocked with the most common heat pump parts to avoid the need for return visits.
Yes. All our heat pump engineers hold F-Gas certification, which is a legal requirement for anyone handling refrigerants. This ensures all work is carried out safely, legally and in compliance with UK regulations. Never let an uncertified engineer touch your heat pump's refrigerant circuit.
Our fixed-price annual service includes a full refrigerant leak check, professional coil cleaning, filter inspection and replacement, electrical connection check, flow and return temperature test, defrost cycle verification, and a written system health report. Service plan customers also get priority same-day repair slots.
Costs vary depending on the fault and parts required. You receive a clear upfront quote before any work begins — no hidden fees. The diagnostic fee is credited toward the repair if you proceed. Call us to discuss your fault and we'll give you an honest indication of likely cost.
We repair and service all major brands including Daikin, Mitsubishi, Vaillant, Worcester Bosch, Samsung, LG, Panasonic, Hitachi, Nibe and Kensa. If you have a less common brand, call us to confirm — our engineers have broad experience across the market.
Yes. We repair both air source heat pumps (ASHP) and ground source heat pumps (GSHP). Ground source systems have additional complexity around the ground loop, but our engineers are experienced with both system types across Northamptonshire.
"Fantastic service from Kirk and his team — he always provides excellent service. He has now fitted our heat pumps too. Absolutely brilliant, would not use anyone else."
"Kirk sourced an impressive system for us. He and his team fitted it all in a day. Absolutely brilliant service — recommended to all our neighbours."
"No hesitation recommending THS. Always responsive, arrives at the agreed time, works to a very high standard, and charges very reasonable prices."
"Really impressed with his service and coming out when he said he would. Diagnosed the problem immediately, had a part with him. 10/10, will use again."