hi guys , first post on here.
anyway a friend of mine has a system boiler and an unvented cylinder. he noticed the pressure gauge was reading close to 4 bar. i told him to drain some water of the central heating system. which he did. the pressure dropped down to 1.5 bar but within 1 minute went back up to 4 bar. this was when the heating was off by the way.
so my question is this
im thinking it could be a a leak in the heat exchanger thereby the central heating loop is becoming mains pressure. although i thought pressure relief valves were set around 3 bar!
or somehow a faulty expansion vessel although it wouldnt explain the fast rise back to 4 bar in pressure(would it?)
any other ideas what it could be as my friend has turned his heating system off now
he hasnt said what boiler/unvented cylinder he has sorry
anyway a friend of mine has a system boiler and an unvented cylinder. he noticed the pressure gauge was reading close to 4 bar. i told him to drain some water of the central heating system. which he did. the pressure dropped down to 1.5 bar but within 1 minute went back up to 4 bar. this was when the heating was off by the way.
so my question is this
im thinking it could be a a leak in the heat exchanger thereby the central heating loop is becoming mains pressure. although i thought pressure relief valves were set around 3 bar!
or somehow a faulty expansion vessel although it wouldnt explain the fast rise back to 4 bar in pressure(would it?)
any other ideas what it could be as my friend has turned his heating system off now
he hasnt said what boiler/unvented cylinder he has sorry