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
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
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
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