combi boiler, pressure continuously increasing.

[johnduffell]

Try turning off the cold feed for a while and turning on a hot tap to release the pressure. Could simply be **an internal component related to hot water costing around 150 pounds** although you need someone to fit it.
*Edited to not name the component just in case

 

[Ready Steady Gas]

If you find the filling loop/valve to be ok, There is a test you can carry out to confirm whether it is an internal part that has a pinhole between the CH and MCW.

1. Turn off call for heat on programmer while testing.

2. Drop system pressure back down to 1.5bar .

3. Isolate CH flow and return valves and hot water outlet valve.

4. Leave for a day and see if the pressure has still risen.

If the answer is yes you will need a registered engineer to change the affected part.