Solar Thermal Repair Manchester
Solar thermal systems are reliable, but faults do develop — particularly in older installations or systems that have not been regularly serviced. Common issues include glycol degradation causing reduced heat transfer, circulation pump failure, faulty temperature sensors giving incorrect readings, air locks in the glycol loop preventing flow, and expansion vessel failure causing pressure problems. Left unaddressed, these faults mean your system generates little or no hot water from solar energy.
Manchester Renewables diagnoses and repairs all types of solar thermal faults across Greater Manchester. Our MCS-certified engineers carry diagnostic equipment including pressure testing tools, multimeters, and thermal cameras to pinpoint issues accurately on the first visit. We repair systems originally installed by any company and carry common replacement parts including pumps, controllers, sensors, expansion vessels, and glycol fluid.
What Is Included?
Fault Diagnosis
Systematic testing of all system components — collectors, pump station, controller, sensors, expansion vessel, and glycol loop — to identify the root cause of the problem.
Glycol Degradation Repair
Drain, flush, and refill of the glycol loop when the heat transfer fluid has degraded. Includes pH testing and freeze point verification of the new fluid.
Pump Replacement
Replacement of failed or seized circulation pumps with compatible units. We carry common Grundfos and Wilo pump models for same-day repair where possible.
Sensor & Controller Repair
Testing and replacement of faulty collector and cylinder temperature sensors, plus controller diagnostics and reprogramming.
Air Lock Removal
Purging trapped air from the glycol loop that prevents fluid circulation. Often caused by pressure drops, leaks, or incorrect filling procedures.
Expansion Vessel Service
Testing and re-pressurising or replacing the expansion vessel that absorbs glycol expansion as the system heats up. Failed vessels cause pressure relief valve discharge.
Repair vs Replace Assessment: Honest guidance
If your solar thermal system is over 20 years old and has multiple faults, replacement may be more cost-effective than repair. We provide an honest assessment and will tell you if a new system would serve you better than patching an ageing one.
Why It Matters
- A non-functional solar thermal system means your boiler is heating 100% of your hot water — costing you £100-£300 per year in unnecessary fuel bills
- Glycol that has degraded to an acidic state will progressively corrode copper pipework and collector internals if not replaced
- A failed pump is one of the most common solar thermal faults and is typically a straightforward, same-day repair
- Air locks are a frequent issue after pressure loss and can usually be resolved in a single visit without replacing any parts
Cost Guidance
Solar thermal repair costs in Manchester typically range from £100-£400 depending on the fault. A diagnostic visit costs £60-£80. Pump replacement costs £150-£300 including parts and labour. Glycol drain and refill costs £100-£150. Controller or sensor replacement costs £120-£250. We provide a clear quote before starting any repair work.