Central heating repairs and fault finding
Fault finding for heating systems with cold radiators, control problems, circulation issues, pump or valve faults and uneven performance across Surrey, Hampshire and Berkshire. We look at the wider system rather than assuming every heating problem is the boiler.
Central heating problems we can investigate
The boiler is only one part of a central heating system. Pumps, motorised valves, thermostats, programmers, radiator valves, air, sludge and circulation can all affect how the system performs.
Radiators not heating
One, several or all radiators staying cold or heating unevenly.
Heating controls not responding
Thermostats, programmers or zone controls that do not call for heat as expected.
Pump problems
Noise, poor circulation or heating performance linked to the central-heating pump.
Motorised valve faults
Zone or hot-water/heating valves not opening, closing or signalling correctly.
Intermittent heating
Heating that works inconsistently or stops before rooms reach temperature.
System pressure or circulation
Heating affected by pressure loss, air, restricted flow or wider system conditions.
Diagnose the system before changing parts
When several components can create the same symptom, replacing parts by guesswork gets expensive quickly. We start with what the system is doing, then narrow down the likely cause.
If the issue points to sludge or restricted circulation rather than a failed component, we’ll explain whether balancing, cleaning or power flushing is worth considering.
Common reasons heating systems perform badly
Poor heating can be caused by a single failed component, but it can also come from setup or system condition. The right fix depends on what the system is actually doing.
Air in radiators
Trapped air can leave radiators partly cold and may point to a wider pressure or circulation issue.
Sludge and restriction
Deposits can reduce circulation and create cold areas, noisy components or slow warm-up.
Incorrect balancing
Flow can favour some radiators and starve others if the system is badly balanced.
Failed controls or valves
A working boiler cannot heat the right areas if the controls or zone valves are not operating correctly.
Central heating repairs across Surrey, Hampshire and Berkshire
LDM Group UK covers Farnborough, Frimley, Camberley, Aldershot, Fleet, Farnham and surrounding areas. Availability depends on the job and location.
More heating help from LDM Group
Central heating repair FAQs
Why are some radiators hot and others cold?
Air, balancing, valves, sludge or circulation problems can all cause uneven heating. The pattern across the system helps narrow down the cause.
Does a cold heating system always mean the boiler has failed?
No. Thermostats, programmers, pumps, motorised valves and other system components can stop heat reaching the radiators even when the boiler itself is operational.
Can you diagnose intermittent heating faults?
Yes, although intermittent faults can take more investigation because the system may need to be observed or tested in different states.
When is power flushing worth considering?
When there is evidence of sludge or restricted circulation across the system. It should be recommended from the system condition, not as a default fix for every heating fault.
Need plumbing, heating, gas or renewables help?
Tell us what you need help with and we’ll get back to you after reviewing the details. For urgent plumbing or heating problems, calling is usually the fastest option.
Send an enquiry
Use the form below and include as much detail as possible.
Need help with a heating-system fault?
Send the symptoms, boiler status and which radiators or zones are affected. Photos of controls or any displayed fault code can also help before the visit.