This is just a to be aware post, regarding a recent problem, especially if you are still having work carried out on a project.
A client who has had a GSHP installed for a year now arrived at his house on 26th Dec and switched the pump on as normal, as on previous visits. This time the safety settings shut the pump down........ result no heating. Phone call at 4pm, the pump has broken down .......no problem, I go over. After about 1.5 hrs we discover that the plumber who had been doing some other work in the property, had shut the underfloor valves off therefore increasing the pressures beyond the limits.
This post has not been commented yet.