🚨 Boiler Fault Codes & Emergency Repairs
🔧 Boiler Fault Codes & Common Issues
Boiler not switching on? No hot water? Losing pressure?
These are some of the most common boiler issues homeowners search for every day.
Sometimes your boiler will show a fault code like F22, EA227, or E133.
Other times, it just stops working with no warning.
👉 At Brown’s Boilers Ltd, we repair all makes and models across Luton, Bedfordshire, Hertfordshire & Milton Keynes.
📞 Call 07852 410530 or 📅 Book Online
🚨 Common Boiler Problems
Even without a fault code, most boilers fail in predictable ways:
Boiler not switching on → Ignition problems, PCB errors, no power supply.
No hot water but heating works → Diverter valve fault or blocked plate heat exchanger.
Boiler losing pressure → Leak, faulty expansion vessel, trapped air.
Boiler overheating → Pump failure, airlock, or blocked pipes.
Boiler won’t stay on → Flame detection problem, gas valve fault, or sensor issue.
👉 No matter the issue, our Gas Safe engineers will diagnose and repair it quickly.
📞 Call 07852 410530 or 📅 Book a Callout.
🔴 Baxi Boiler Fault Codes
E110 – Overheating
Causes: Pump fault, airlock, blocked pipes.
Meaning: Boiler shut down for safety.
Process: Diagnose circulation, test pump, flush if needed.
👉 📅 Book Baxi Callout
📞 07852 410530
Other Baxi Codes Covered:
E119 (Low Pressure), E133 (Ignition Fault), E160 (Fan Fault), E168 (PCB Error),
E125 (Circulation Fault), E20 (Sensor Fault), E28 (Flue Gas Sensor Fault),
E50 (Hot Water Sensor Fault), E80 (DHW Sensor Fault).
🔴 Ideal Boiler Fault Codes
F1 – Low Pressure
F2 – Flame Loss
F3 – Fan Fault
F4 – Flow Thermistor Fault
F5 – Return Thermistor Fault
F6 – Outside Sensor Fault
F7 – Low Voltage
F9 – PCB Fault
L2 – Ignition Lockout
LF – No Flame Detected
👉 👉 📅 Book Ideal Callout
📞 07852 410530
🔴 Main Boiler Fault Codes
E119 – Low Water Pressure
E133 – Ignition Fault
E160 – Fan Fault
E161 – Gas Valve Fault
E168 – PCB Error
E110 – Overheating
E128 – Flue Sensor Fault
E120 – NTC Sensor Fault
E129 – Flame Extinguished
E134 – Ignition Lockout
👉 📅 Book Main Repair
📞 07852 410530
🔴 Glow-worm Boiler Fault Codes
F1 – No Ignition
F3 – Fan Fault
F4 – Flow Thermistor Fault
F9 – PCB Fault
F11 – Flow Sensor Issue
F12 – Return Sensor Fault
F14 – Heating Flow Temp Fault
F16 – Flame Detection Fault
F22 – Low Pressure
F27 – False Flame Detection
👉 📅 Book Glow-worm Callout
📞 07852 410530
💷 Callout & Repair Costs
£105 callout charge during normal hours (includes first hour’s labour).
If it’s a simple fix (like repressurising or clearing a condensate), it’s usually completed within that time.
If parts are needed, we’ll provide a separate fixed-price quote.
Emergency and out-of-hours callouts also available (extra charge).
🔴 Worcester Bosch Boiler Fault Codes
EA227 – No Flame Detected
Most Common Cause: Blocked condensate pipe (especially in winter).
Other Causes: Ignition fault, gas valve issue, burner problem.
What It Means: Boiler tried to ignite but no flame was detected.
Our Process: Diagnosed during £105 callout (includes first hour). If it’s a blocked condensate, we’ll fix it within the hour. Parts quoted separately if needed.
👉 📅 Book Worcester Callout
📞 07852 410530
🔴 Vaillant Boiler Fault Codes
Vaillant boilers, including the popular ecoTEC models, use 'F' codes to indicate a safety lockout. While low pressure (F.22) can sometimes be a safe DIY fix, **all other codes should be resolved by a Gas Safe registered engineer.**
| Fault Code | Common Meaning | Our Process |
|---|---|---|
| F.22 | Low Water Pressure | Repressurise system, check for leaks, test expansion vessel. |
| F.28 | Ignition Failure | Check gas supply, ignition electrode, and clear condensate pipe. |
| F.29 | Flame Loss / Re-ignition Failed | Test gas valve, inspect flue for blockages, check gas pressure. |
| F.75 | Pump / Pressure Sensor Fault | Test pump function, check pressure sensor, diagnose wiring. |
| F.32 | Fan Fault | Test fan motor and wiring, inspect PCB connections. |
| F.61 / F.62 | Gas Valve Fault | Test gas valve regulation and electrical connection. |
| F.72 | Flow / Return Sensor Fault | Test NTC sensors for correct temperature readings and replace if faulty. |
👉 📅 Book Vaillant Callout
📞 07852 410530
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