boilerintermediate
Why won't my boiler fire up or start?
Gas Safe Engineer
4 min read
Updated 28 Nov 2024
63 found helpful
Quick Answer
Boilers fail to start due to thermostat issues, gas supply problems, ignition faults, or safety lockouts.
Complete Guide
When your boiler won't start, it's frustrating - especially during cold West Midlands winters. Here's a systematic approach:
**Check These First:**
1. **Thermostat Settings** - Ensure it's calling for heat and set above room temperature
2. **Gas Supply** - Check other gas appliances work (hob, oven)
3. **Electrical Supply** - Confirm boiler has power and no tripped switches
4. **Pressure Gauge** - Must be between 1-2 bar for most boilers
**Common Boiler Faults:**
- **Ignition Problems** - Spark electrode or gas valve issues
- **Flame Sensor** - May be dirty or failed, preventing ignition
- **PCB Faults** - Control board issues requiring professional repair
- **Pump Problems** - Circulation pump may have seized
**Modern Boiler Error Codes:**
Different manufacturers show specific error codes:
- Vaillant: F28 (ignition fault), F22 (low pressure)
- Worcester Bosch: EA (ignition lockout), E9 (PCB fault)
- Baxi: E133 (ignition fault), E125 (circulation fault)
**Safety First:**
Never attempt to repair gas components yourself. If you smell gas, turn off the supply and call the Gas Emergency Service (0800 111 999).
Our Wolverhampton-based engineers carry most common parts and can often restore heating the same day.
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