My ten year old 28Cdi has started to have a problem with the hot water. The symptoms are as follows:
* Central heating works perfectly
* When switching on a hot tap, the machine will produce hot water for 20 seconds, then shut off the burner, then start producing hot water again. The cycle will continue for as long as the hot tap is on.
* When the burner shuts down, the demand light is still illuminated, and the machine shows no fault codes
* Just before shutdown, the central heating pressure needle flickers 3mm back and forth.
* I swear the hot water has started to smell of something strange. The wife disagrees.
After a search of the forum, I suspect the water to water heat exchange is leaking, or got a pin hole, and so the hot water system is boiling through to the central heating circuit, and vice versa? Is this possible?
I've also seen a lot of posts where the exchanger gets blocked. We're in a heavy limescale area, if that's important.
Thanks
Gary
* Central heating works perfectly
* When switching on a hot tap, the machine will produce hot water for 20 seconds, then shut off the burner, then start producing hot water again. The cycle will continue for as long as the hot tap is on.
* When the burner shuts down, the demand light is still illuminated, and the machine shows no fault codes
* Just before shutdown, the central heating pressure needle flickers 3mm back and forth.
* I swear the hot water has started to smell of something strange. The wife disagrees.
After a search of the forum, I suspect the water to water heat exchange is leaking, or got a pin hole, and so the hot water system is boiling through to the central heating circuit, and vice versa? Is this possible?
I've also seen a lot of posts where the exchanger gets blocked. We're in a heavy limescale area, if that's important.
Thanks
Gary