E02 error code
E02 – No ignition after restart
What does Keston Keston C45, C40P, C55 and C55P condensing boilers E02 mean?
Keston documents E02 for the C45, C40P, C55 and C55P as “No ignition after restart”. This meaning applies to this controller family and should not be transferred to another Keston product without checking its manual.
The code identifies the condition detected by the product; it does not always identify the failed component on its own. Confirm the full code and exact model before ordering parts or attempting a reset.
The Keston Keston C45, C40P, C55 and C55P condensing boilers E02 error code indicates keston documents E02 for the C45, C40P, C55 and C55P as “No ignition after restart”. This meaning applies to this controller family and should not be transferred to another Keston product without checking its manual. This guide explains what the code means, the symptoms and likely causes, the checks that are safe to make, and when to stop and arrange an authorised repair.
Symptoms you may notice
The display shows E02; the boiler enters lockout and will not attempt to restart until the fault is corrected and Reset is pressed.
Common causes
The manufacturer associates E02 with no ignition after restart, involving the related pressure, circulation, temperature-sensing, fan, ignition, gas, flue-safety or controller circuit.
Before you start troubleshooting
Use the display, rating label or product menu to confirm the exact model. Similar-looking codes can have different meanings across product generations and regions.
- Record the complete code before switching the equipment off.
- Check only user-accessible controls, filters and external connections described in the manual.
- Do not open gas, refrigerant, combustion or electrical compartments.
Troubleshooting steps
A Gas Safe registered engineer should diagnose the no ignition after restart using the official fault table and wiring information.
Can you fix this error code yourself?
The safest next step depends on the exact model and the cause behind the code. External checks may help, but a returning fault needs professional diagnosis.
A successful reset is not proof that the underlying issue is fixed. If E02 reappears, note when it happens and give that information to the service engineer.
Reset instructions
After the cause has been corrected, press Reset once. If the same lockout returns, stop and arrange professional diagnosis.
Applicable products and models
Keston C45, C40P, C55 and C55P condensing boilersC45; C40P; C55; C55P2010 manual generationWhen to contact a professional
Contact a suitably qualified Gas Safe registered engineer when a block persists, a lockout returns, or diagnosis requires internal measurements, wiring checks or replacement parts.
Frequently asked questions
What does Keston Keston C45, C40P, C55 and C55P condensing boilers E02 mean?
Keston documents E02 for the C45, C40P, C55 and C55P as “No ignition after restart”. This meaning applies to this controller family and should not be transferred to another Keston product without checking its manual.
Can I fix Keston Keston C45, C40P, C55 and C55P condensing boilers E02 myself?
Some external checks may be suitable for the user, but the result depends on the exact model and cause. Use the official manual and arrange service if the code returns.
Should I reset the product after code E02?
After the cause has been corrected, press Reset once. If the same lockout returns, stop and arrange professional diagnosis.
When should I arrange a repair?
Contact a suitably qualified Gas Safe registered engineer when a block persists, a lockout returns, or diagnosis requires internal measurements, wiring checks or replacement parts.