Keston Boiler Error Codes, Causes & How To Fix

Keston boiler error codes and faults: What they mean and how to fix them

When your Keston boiler isn’t working how it should, you need to get it up and running as soon as possible. The error code displayed on your boilers control panel provides you with some information on what might be going on.

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Now, error codes aren’t exclusive to Keston boilers; problems with the heating and hot water are displayed this way by all boiler manufacturers. New boilers and old boilers alike, things can go wrong so we’re here to help.

Common Keston Boiler Error Codes & Faults

In this article, we’re going to focus on the codes which may appear on your Keston boiler. We’ll start with the most common codes and then finish off with the complete list.

The best combi boilers and system boilers can break, but the good news is that for some of the issues, there’s a good chance that you’ll be able to fix the problem yourself without needing to call the Keston boilers technical helpline or arrange for an engineer to come out!

How to fix error code E12

When you get the Keston boiler error code E12, it will, unfortunately, mean that an engineer needs to be called out. That’s because this code means that there has been a blown thermal fuse that needs replacing. As this requires the boiler cover to be removed, only a gas certified engineer can undertake the repair.  

If your boiler is under warranty, contact the Keston boiler repairs hotline, and they’ll arrange for an engineer to visit. If you don’t have warranty cover, we strongly recommend getting boiler cover in place before any problems happen to make sure that you don’t need to deal with unexpected repair bills.

How to fix error code E37

The Keston boiler e37 error code means a problem with the water pressure within your system. This is one which you’ll be able to sort out yourself as this simply needs more water adding to your boiler until the correct pressure is reached. For information on how to do this, check your boiler manual. Electronic copies can be found on the Keston website.

To understand more about pressure issues, our complete guide can be found here.

How to fix error code E28

The Keston boiler error code e28 usually means that you’re not getting any hot water or heating. It’s caused by a faulty fan, and often you’ll see the boiler pump working for around five seconds and then it goes into lockdown.

This one will need an engineer to come out and, first of all, check if there is an issue with the power to the fan, and if that seems okay, then a replacement will be needed.

How to fix error code E67

The Keston boiler error code e67 means that the water pressure in your heating system is too low. This means that you need to top up the water while keeping an eye on the pressure gauge; you’re aiming for a pressure of between 1 and 2 bar.

If the pressure keeps dropping, this may be the sign of a boiler water leak, and that will need the help of an engineer to carry out a repair.

See how much a boiler service costs here which can pick up any early keston boiler problems.

All Keston Boiler Error Codes

 Take a quick look at our comprehensive list of fault codes you will find with your Keston boiler. If your issues are serious then we can also help you find out what a new boiler cost.

C36 Combi Gas Boiler Error Codes

Fault Code	Possible Cause
E01	Failure of the ignition
E02	False flame and may be issues with the gas supply
E03	Overheated boiler
E05	Failure of the fan
E07	Overheated flue
E08	Problems with the flame circuit
E09	Error with the valve drive
E10	Faulty control box
E11	Failure of the calibration tests for the flow and return sensors
E12 to E22	Faulty control box
E23	Error with the water filling process
E24	Low pressure detected four times in the last 24 hours
E25	Faulty control box
E26	Flame dropping out
E28	Faulty fan
E30	Short circuit of the flow sensor
E31	Open circuit within the flow sensor
E32	Short circuit of the DHW sensor
E33	Short circuit of the hot water sensor
E34	The mains supply has dropped below 180V
E35	Issues with the mains supply frequency
E37	Water pressure incorrect
E38	Faulty reset key
E40	Water pressure too high
E41	Error of communication between fascia and control box
E43	Return sensor has short-circuited
E44	Open circuit on the return sensor
E45	The Flue sensor has short-circuited
E46	Error of communication error between the fascia and control box
E67	Water pressure is below 0.4 bar
E99	Short circuit of the flue sensor

 

S30 System Gas Boiler Error Codes

Fault Code	Possible Cause
0	Standby mode
C	Desired temperature not yet reached
C And Burner Light	Operational for hot water and heating
F And Burner Light	Frost mode in operation
F0	Missing boiler chip code
F6	Failure of the outside sensor
F7	Mains voltage too low
F9	Fault within the printed circuit board
L5	Too many boiler resets within 5 minutes
L6	Lockout due to false flame warning
C0	Fault with the boiler chip card
C2	Fault with the boiler chip card
F1	Water pressure too low
L1	Overheating of the flow temperature
F2	Loss of flame
L2	Loss of flame
F3	Fault with the fan
F4	Fault with the flow thermistor
F5	Fault with the return thermistor

 

Keston c40 Boiler Error Codes

Fault Code	Possible Cause
Enn	Boiler shut down because of a fault in the system
E00	Unexpected flame has been detected
E02	Faulty ignition after the boiler has been restarted
E03	Faulty or disconnected gas valve
E04	Boiler in lockout followed by a power reset
E11	Problem with the internal electronics
E18	Overheating of the flow
E19	The return water has exceeded the maximum allowed temperature
E25	Rapid increase of the flow temperature which exceeds the allowed parameters
E30	Difference in temperature between flow and return is too high
E31	Short circuit of the flow thermistor
E32	Short circuit of the return thermistor
E36	Open circuit on the low thermistor
E37	Open circuit on the return thermistor
E44	Water pressure too low

Summary

All boilers develop faults from time to time but knowing what the error code means could help you fix it yourself or get an engineer out asap.

Don’t forget that keeping up to date with your Keston boiler service schedule will also help to identify minor problems before they become critical.

There will come the point, though, where your boiler reaches the end of its life or where the cost of repairs just isn’t feasible for an old system.

There are other less known boiler manufacturers to you could explore such as Navien boiler error codes & Daikin boiler error codes so that you can see just how common these issues are with brands that don’t have as much pedigree as the main ones.

Then comes the search for a new boiler. With so many choices now available, our fixed price boiler installation service is a great place to start.

Simply provide a few details about your home and your heating requirements, and you’ll be instantly provided with great boiler deals for the perfect boiler system.