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Discuss Heating system keeps losing pressure in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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stratplus

Plumbers Arms member
Plumber
Gas Engineer
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Can anyone add to this list of possibilities:
Leak on rads valves etc
Leak on pipework
Leak on air vents manual and auto
Expansion vessel lost charge
Prv passing
Plate hx leaking on primary side

Anything other than the obvious.
If plate hx was mixing with incoming cold the pressure would be higher on gauge and Prv would be constantly passing so no pressure lost .....right?
 
hex leaking internally and dripping down condense
 
hex leaking internally and dripping down condense
Interesting, can you explain that one in more detail Shaun please.
To my knowledge the hx has four ports:
Primary F and R
Cold in and hot out
Condense collected from flue gases
How would you lose heating water/mains water through condense?

Ok, you mean main hx not plate.
Still lost though.
 
Yes main hex

Would be heating water
 
Main hex could be gone leaking CH contents down the condensate. Is the condensate constantly dripping?
Something I’ve never thought of tbh. Worth a look.
Pressure takes a couple of weeks to resch zero from 1 bar. If the main hx was leaking from internally wouldn’t the pressure drop be much quicker?
 
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