Hi All
Bizarre circumstances with one of my customers.
I got a phone call at beginning of week - no hot water. Said I couldn't go until next day - they got someone else.
Customer phoned yesterday to say they now had no central heating or hot water. I went and had a look. Seemed system air locked, so sent some mains water down the vent pipe...
All seemed ok, rads heating up, hot water circulating through cylinder - so left.
Customer called - no hot water... me thinks - this is the original problem, other plumber managed to air-lock system and not fix hot water problem...
Took a while to figure out - very hot water at outlet of cylinder, cold water at tap - how come?! Went up to attic and found the clip holding the cylinder vent pipe had broken, the vent pipe now below the surface of the tank - so syponing to the taps - bizarre... and other plumber had obviously not sorted.
Now customer has hot water & central heating. However I noticed that the vent pipe for the central heating is constantly running - pumping over, the water in the header tank roasting. This had been going on all day, and condensation now dripping off roof in attic. What could cause this to happen to a previously working system?
The vent (22mm) and feed (15mm) pipes connect together within 4" of each other at the inlet to the pump. Although the vent is pumping over, the tank is not filling, so the water going in to the tank through the vent must be leaving through the feed pipe. It's as if the connection between the two pipes at the pump inlet is blocked... only thing I can think of, but doesn't seem likely.
Please help!!
Cheers Colin