🔧 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 – £105.

⚡ Quick Brand Links

• Baxi Boiler Fault Codes

• Worcester Bosch Boiler Fault Codes

• Vaillant Boiler Fault Codes

• Ideal Boiler Fault Codes

• Main Boiler Fault Codes

• Glow-worm Boiler Fault Codes

🚨 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 – £105.

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🔴 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 – £105
📞 07852 410530

Other Worcester Codes Covered:

• E9 – Overheating

• EA229 – Low Voltage

• EA234 – Condensate Pump Fault

• C6 – Fan Speed Fault

• D5 – NTC Sensor Fault

• E3 – Flow Temp Sensor Fault

• E5 – Fan/Air Pressure Switch Fault

• 224 – Dry Fire (No Water)

• H07 – Low Pressure

• H11 – Communication Fault

👉 📅 Book Worcester Repair – £105

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🔴 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 – £105
📞 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).

👉 📅 Book Baxi Repair – £105

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🔴 Vaillant Boiler Fault Codes

F22 – Low Water Pressure

• Causes: Leak, faulty expansion vessel, trapped air.

• Meaning: Boiler shut down due to low pressure.

• Process: Repressurise, test vessel, leak check.

👉 📅 Book Vaillant Callout – £105
📞 07852 410530

Other Vaillant Codes Covered:

F28 (Ignition Fault), F29 (Flame Loss), F75 (Pump/Pressure Sensor),
F32 (Fan Fault), F36 (Flue Blocked), F61 (Gas Valve Fault),
F62 (Gas Valve Closing Fault), F72 (Flow/Return Sensor),
F83 (Flow Temp Too Low).

👉 📅 Book Vaillant Repair – £105

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🔴 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 – £105
📞 07852 410530

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🔴 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 – £105
📞 07852 410530

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🔴 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 – £105
📞 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).

👉 📅 Book Your Boiler Callout Now – £105
📞 Or call 07852 410530