Question about Heating & Cooling
If this occurs when the unit is in use for only hot water, there will be an internal leak in the secobndary heat exchanger, you will have to replace it. check first that the charging link has been removed when testing to ensure it is not passing.
if it happens when the heating is switched on then check the presure in the expansion vessel ( dump all presure from system and use a car foot pump with a gauge there should be 1 bar presure) that is the big red thing behind the pump, if water comes out of the test valve on the front of it when you try to test it or it wont hold the presure you will have to replace it (a nasty job you have to strip half the boiler) if you can pump it up make sure you release the presure in the system as you pump it or you will get a false reading
Posted on Sep 07, 2008
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Posted on Jan 02, 2017
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Apr 13, 2011 | Heating & Cooling
Feb 05, 2011 | Heating & Cooling
From your description it seems that the water in solenoid valve - fill valve is blocked open due to scale deposits. The solenoid valve can be disassembled and be cleaned; this is the only way to solve the problem. The flushing with vinegar can help but only sometimes and for a while but sometime can move more scale deposit in it and blocked it more. Since you will clean the system from scale you should check also the water level sensor since this also full of scale and can malfunction too.
The pressure rise due to overfill of water in the boiler and not from exceed pressure in it.
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