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Mend Worcester Combi Drop

We have a Worcester 350 Combi and is shutting down after 2-3 hours. ?

We have a Worcester 350 Combi and is shutting down after 2-3 hours with the pressure dial showing a drop to below 0.5. We have to add more water up to pressure and restart. This gets the CH and HW OK again for about 3 hours when the presssure then drops quickly, the boiler shuts down and the whole cycle needs to be repeated. There are no signs of a leak anywhere visible and the outside drain/overflow pipe is dry. Any ideas?

Mike
January 2010
expantion vessel may need recharging

b
January 2010
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Mend Heating, Home Heating Systems
Free repair help for Worcester home heating systems