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Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 1561
Experience:  30 Years on the tools, now retired, Ex CORGI
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We have the issue with a Keston C55 showing B26 error code -

Customer Question

We have the issue with a Keston C55 showing B26 error code - not sure what to do to get pressure back up
JA: How old is the appliance? Have you gotten error messages before?
Customer: only once before - its on the wall - about 6 years old
JA: Do you plan on doing the work yourself?
Customer: if possible - assume increasing the pressure isn't an electrical issue
JA: Anything else we should know to help you best?
Customer: anything else you need to know?
Submitted: 8 months ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 8 months ago.

Are you referring to the water system pressure in the heating

Customer: replied 8 months ago.
but the water pressure from the entry point is over 1.5. which should be fine. For some reason the boiler itself does not seem to be resetting the warning code - which is b26 from below table.Is there an internal reset switch for the pressure measure? The boiler reset doesn't seem to do that.Below is extract from Keston user guides;It is the 9 nn Boiler off due to unexpected problem. The boiler will attempt to
re-fire from this mode. In this mode the display will alternately
flash “9 nn” and “b xx” where the “xx” has the following meaning:
b 18 Boiler ran too hot, > 95OC flow temperature
b 19 Boiler ran too hot, > 95OC return temperature
b 24 Boiler circulating in reverse. Check external pump
b 25 Boiler rising in temperature too quickly. Check for system
b 26 Low water pressure. Top up system pressure and check
for leaks.
b 28 No signal from fan, possible stuck fan motor.
b 29 Fan running when not required.
b 30 Circulation too slow. Check system for blockages
b 65 Waiting for fan to start. Possibly stuck.
All of the above displays, up to “A nn” indicate normal boiler operation. Display “9 nn”
indicates a delay in boiler operation but will not stop boiler operation.

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