Combi boilers are not suitable for larger properties with 3, 4 or more bathrooms. Find out more about our boiler care range we're here to help. The tank must be completely full before connecting the wiring to avoid dry firing – which ruins the heating element. If that doesn’t seem to be the issue, next, find the schrader valve on the expansion vessel (it looks like an air valve found on a car or bike tire) unscrew the plastic cover.
Added: 2018-06-29 | Category: boiler service