A real weird one (to me, anyway)

[DIWHYWHYWHY]

This is a bizarre one (in my eyes, anyway).

Here goes:-

SIME Friendly Boiler. Central Heating is absolutely fine. It's the DHW that has the trouble. So long as the boiler is on, I get DHW when I turn on the hot tap in the kitchen...........and it's consistently hot too. Turn off the boiler and the hot tap water is then cold (and boiler doesn't fire up) when I turn this tap.

Next to the bathroom. With the boiler either on/off, I get DHW when I turn the hot tap on here. Only problem is that it doesn't stay hot and goes lukewarm. I need to turn it off and then turn it back on to get more hot water. Then it cools off after about 30 secs. Incidentally, the boiler fires up when I turn on the hot water tap in the bathroom when the boiler is off (as it should).

What the hell is going on here? Should I call an exorcist instead of a plumber????

 

[Agile]

It may be weird to you but its all in a days work to a boiler engineer.

Next, the Sime Friendly is anything but!

Sounds like the diverter valve diaphragm is failed.

Tony

 

[DIWHYWHYWHY]

Further to my last post, turns out Tony was bang on. So engineer replaced the old diverter valve with brand new one. He also fitted a new pump which was needed too.

So......all sorted now with lovely piping hot water once again. However.......


....this is something I've noticed since the repair. The boiler is behaving very differently. Although the central heating works fine, the radiators are not hot all the time like they were before. They do get hot but they don't remain so, rather they cool down and then heat up again. Is this normal, even though the CH thermostat dial is set to MAX? (I don't have a room thermostat)

 

[DIWHYWHYWHY]

No takers on this one yet?

 

[Agile]

Thats not normal so you need that looked at.

You should also have a room stat to control the temperature.

Tony

 

[Ray84]

Further to my last post, turns out Tony was bang on. So engineer replaced the old diverter valve with brand new one. He also fitted a new pump which was needed too.

So......all sorted now with lovely piping hot water once again. However.......


....this is something I've noticed since the repair. The boiler is behaving very differently. Although the central heating works fine, the radiators are not hot all the time like they were before. They do get hot but they don't remain so, rather they cool down and then heat up again. Is this normal, even though the CH thermostat dial is set to MAX? (I don't have a room thermostat)

last time i battled with a blow torch to replace the diverter valve a few days later the new 1 started sticking and played up with the heating (probably due to sludge in system) so a second diverter valve was needed before it worked
it could possibly be the speed the new pump is set at check thats at speed 3 on the side of it?
Ray

 

[Biguns]

Are the radiators fitted with TVR's and is room temperature maintained

 

[DIWHYWHYWHY]

Yes, TRVs on rads. All set to MAX. They have NOT been touched since the repair was carried out, and prior to the job being done, the rads were all hot and didn't cool down.

 

[DIWHYWHYWHY]

Gonna get an engineer out asap. It could be a speed setting on the pump now you mention it.