The thermostat on my Potterton Diplomat 55/68 is not functioning correctly in that the water is either very hot or not warm enough. The original Ranco NCA 314133 is no longer available. A,Is there an alternative that can be used? or B,is it possible to repair the existing unit? and C, are second hand units available?. Any information gratefullu received .

John andrew, May 2009

There should be a Suitable alternative Ranco Thermostat for this unit ask your Service Engineer to Talk to the supplier for advice

www.elanar.co.uk, May 2009