Gledhill Boiler Repairs London
Over 20+ years experience with Gledhill Boilers
Insurance approved
90% repaired on the same day
0203 695 3137
How we can assist with your Gledhill Boilers
- Emergency Boiler Repairs
- Boiler Service
- Landlord Safety Certificates
- New Boilers Installations
- Leaking & Noisy Boilers
- Power Flushes
Boiler Repairs R Us are experienced in handling all types of Gledhill Boilers. We can also assist with all gas, condensing, combi boiler installations and upgrades. All our plumbers are Gas Safe Registered so you can be assured all our work is carried out within the required regulations. So for complete customer satisfaction call us on 0203 695 3137 to get your Gledhill Boilers repaired today!
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Gledhill Help Hub: Fault Codes, Hot Water Issues & Quick Checks
Quick checks, common Gledhill problems (thermal stores, cylinders and GB boilers), and when to call a qualified engineer.
Safety First
Smell gas? Do not touch anything. Do not use switches. Open windows, leave the property, and call the National Gas Emergency Line: 0800 111 999.
CO alarm sounding? Treat it as real. Open windows and doors, get everyone out immediately (including pets), then call 0800 111 999 from outside.
If anyone feels unwell (headache, dizziness, nausea, confusion, chest pain, breathless, collapse), call 999.
More information: Carbon monoxide safety guide.
Unvented cylinder warning: If you have water discharging constantly from a pipe outside, a tundish is dripping steadily, or the hot water is dangerously hot,
do not turn valves randomly. Turn off the heat source if you can (boiler/immersion) and call an engineer. Unvented cylinders must be serviced by engineers qualified for unvented hot water systems.
No gas smell, no alarm? Try the quick checks below.
Quick Checks Before You Call
These take 60 seconds and fix many common issues:
- Identify what you actually have – a Gledhill thermal store (BoilerMate / PulsaCoil / Torrent), an unvented cylinder (e.g., StainlessLite), or a GB-series boiler. The fix depends on the product.
- Check system pressure (if you have a pressure gauge) – if below 1 bar, top up to around 1.2 to 1.5 bar. Full guide:
Boiler pressure guide. - Note any fault codes / LEDs – write down flashing lights, display codes, and what was happening when it failed (hot water only, heating only, both).
- Check your fuse box – thermal stores and cylinders often rely on an immersion heater/timer and can trip a circuit.
- Check programmer settings – hot water and heating schedules can change after power cuts or clock changes.
- Reset once only (if applicable) – if it locks out again, stop. Repeated resets can mask overheating or electrical faults.
- Freezing weather? – if you have a condensing boiler, the condensate pipe may be frozen. See:
How to fix a frozen condensate pipe.
About Gledhill Products
Gledhill is a UK manufacturer (Blackpool) best known for hot water storage solutions used in London flats and houses, including thermal stores and unvented cylinders. Many “Gledhill problems” are not gas boiler faults at all – they are hot water storage / control issues (immersion heaters, thermostats, pumps, valves, scale and sensors).
- PulsaCoil – electric thermal store units (common in flats without gas)
- BoilerMate – thermal stores that work with an external boiler
- Torrent – higher output thermal stores for larger properties
- StainlessLite – unvented cylinders (mains pressure hot water)
- GB-series boilers – condensing boilers (less common)
Important: If you have a Gledhill thermal store, you may have two “systems” to diagnose: the store itself and the boiler that feeds it.
Jump to the Right Section
Gledhill GB-Series Condensing Boiler Fault Codes
These apply to Gledhill GB boilers only. If you have a thermal store/cylinder, scroll to the next section.
| Code | What it Usually Means | Urgency | Safe DIY Check? |
|---|---|---|---|
| C0 / FF | Status / no fault stored (display depends on model) | Low | Yes – check if another code is present |
| 01 | Flow sensor fault (open circuit) | Medium | No – call engineer |
| 02 | Flow sensor fault (short circuit) | Medium | No – call engineer |
| 03 | Return sensor fault | Medium | No – call engineer |
| 04 | Flue sensor fault | Medium | No – call engineer |
| 05 | Flame lost during operation | Medium | Check gas is on, reset once |
| 06 | No ignition | Medium | Check gas is on, reset once |
| 07 | Fan speed not achieved / airflow issue | High | No – call engineer |
| 08 | Gas valve fault | High | No – call engineer |
| 09 | Overheat protection activated | High | No – do not keep resetting |
| EE | Internal error / control issue | Medium | Wait 2 minutes, reset once; call if it returns |
Rule: If the same code returns after one reset, stop and book an engineer.
Thermal Store Problems (PulsaCoil / BoilerMate / Torrent)
Thermal stores are “hot water systems” rather than boilers. Common failures are electrical (immersion heater/timer), sensor/thermostat issues, scale, pumps, and motorised valves.
| Problem | Likely Cause | Safe DIY Check? |
|---|---|---|
| No hot water (PulsaCoil) | Immersion heater fault, timer/programmer issue, thermal cut-out tripped, or no power | Check power/timer/fuse; call if it persists |
| Lukewarm hot water | Scale build-up, thermostat issue, sensor fault, insufficient heat-up time, or blending valve issue | No – call engineer |
| Water dangerously hot | Thermostat stuck, sensor fault, or control issue | No – call engineer (safety) |
| No heating via BoilerMate | External boiler fault, diverter/zone valve issue, pump issue, or control wiring fault | Check the boiler display first |
| Store noisy / kettling | Limescale build-up, restricted heat exchanger flow, pump strain | No – call engineer |
| Pressure loss (if sealed system) | Leak in pipework/radiators, PRV discharge, expansion vessel issue | No – top up once; call if it drops again |
Unvented Cylinder Warnings (StainlessLite and Similar)
Unvented cylinders deliver mains pressure hot water. They are safe when maintained, but faults must be treated seriously.
Do Not Ignore These Signs
- Water discharging from the outside pipe or steady dripping through the tundish
- Hot water extremely hot or “scalding” at taps
- Pressure relief valve running after heating
- Visible leaks around cylinder valves or pipework
Turn off the heat source if you can (boiler/immersion) and call an engineer. Never cap or block a discharge pipe.
How to Top Up System Pressure
If your pressure gauge shows below 1 bar (common with boiler-fed systems):
- Find the filling loop – often a braided hose with two valves near the boiler or near the store/cylinder.
- Open valves slowly – you should hear water entering.
- Watch the gauge – stop at 1.2 to 1.5 bar. Do not exceed 2 bar.
- Close valves fully – return both to the closed position.
- If it drops again soon – you likely have a leak or an expansion vessel/PRV issue. Book a diagnosis.
More detail:
Complete pressure guide.
Is This Urgent?
Not every fault needs an emergency callout:
| Situation | Urgency |
|---|---|
| No heating but hot water works | Usually safe to wait |
| No heating or hot water, vulnerable person at home | Call now |
| Any smell of gas | Emergency – call 0800 111 999 |
| CO alarm sounding | Evacuate – call 0800 111 999 |
| Unvented cylinder discharge / water too hot | Call now – safety issue |
| Boiler/store/cylinder leaking water | Call today |
| Fault clears after one reset | Book a service soon |
| Repeated lockouts (two or more times) | Call today |
Sludge, Kettling, or Cold Radiators?
Limescale and sludge contribute to overheating, noise and poor circulation. A
power flush cleans the system and helps protect your boiler and controls.
Read our power flush guide.
Frequently Asked Questions
Can you repair Gledhill PulsaCoil units?
Yes. PulsaCoil units are common in London flats without mains gas. We diagnose issues such as immersion heater faults, thermostats, thermal cut-outs, control wiring, pumps and sensors.
Is it worth repairing an older Gledhill thermal store?
Often yes. Gledhill thermal stores are generally well made and many parts are available. If scale build-up is severe or repeated electrical failures occur, replacement can become the smarter long-term option. We will advise honestly.
More detail: Repair or replace guide.
How often should I service my Gledhill system?
Once a year, ideally before winter. Unvented cylinders should also be serviced periodically to ensure safety valves and controls are working correctly. See:
Boiler servicing.
Do I need a Gas Safety Certificate for a PulsaCoil?
No – PulsaCoil is electric. However, if your thermal store is fed by a gas boiler, that boiler must be checked annually in rental properties. See:
Landlord Gas Safety Certificates.
Renting This Property?
Tenants: Contact your landlord or letting agent first. They are responsible for arranging repairs. Keep a written record of your report.
Landlords: Stay compliant with our
landlord checklist and book your annual
Gas Safety Certificate (for gas appliances).
Gledhill Repairs Across London
We repair Gledhill thermal stores, cylinders and (where installed) GB-series boilers across North, South, East, West and Central London. See our full
London coverage.
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Experienced engineers across London. No call centres.
Our Services
Boiler Servicing
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Gas Safety Certificates
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