I have a 5 yr old keston c40. good boiler, replaced fan assembly, but keep getting C 59-61. The bolier shuts down with E37. The fan assembly was replaced 3 years ago. Please help!

Nimmi, September 2009

these are not fault but run codes c for central heating and the later the temp at that time. the other code is a faulty or wet thermistor

richard from greenheat, January 2010

E.37 is a Faulty Return Thermistor, these normally get damaged from water leaking from the AAV above. so probably two Faults to see to

The c 59 - 60 - 61 are actually Thermostat settings, you get the "c" code when turning either of the two temp control knobs and ARE NOT A FAULT

Good news the Two items identified above are not expensive!!

www.elanar.co.uk, September 2009