Any plumbers in da house? combi boiler question.

[owdamer]

I just got home from work, its snowing and my bloody heatings not come on.
I got a combi bolier, it seems to be operating ok if I turn the hot tap on in the bathroom & kitchen, but i'm not getting any heat to the radiators.
tried bleeding the rads & i just get cold water.
boiler pressure is ok.
any ideas??
other info, all rads have thermostats fitted.
i was wondering if pump is knackered, but if that was the case would i get hot water thru taps??

[True Blue]

When you say the pressure is ok, what is it at?
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[The Old Geeza]

[Johnny GSX-R]

Mine has a seperate control to switch the radiators on/off.........have you switched yours off.

My hot water still flows but it cancels out the radiator pump.

[owdamer]

Just had the plumber round. the pumps cream crackered. he's replaced the pump but we're having problems getting it all going again coz we air locks and the water pressure here is so low it cant shift the air out....

[feef]

may combi boilers have a sealed, pressurised heating circuit. Bleeding the radiators only lets the pressure out the system, and lessens the effectiveness of the heating,

if it's a sealed system, there's no way for the air to get in, as if there was a leak, water would b escaping since it's under pressure, unlike a standard, open boiler,header tank system.

a
____________________
Mudskipper wrote: feef, that is such a beautiful post that it gave me a lady tingle
Windchill calculator - London Bike parking
Blog and stuff - PlentyMoreFish dating

[it really is that quick]

to free air from the system run boiler for about a minute then switch off , go round and bleed all radiators, repeat as many times as is necessary. you'll know when there free as you'll hear gurgling as air finds it way to the highest point.

any plumber worth his salt should have bleed all the radiators for you.

in fact any plumber worth his salt should have just isolated the boiler on the flow and return coming into your boiler and not drained down your system, thus eliminating the need to bleed radiators etc..


rob
____________________
not just any short of winnah... But a Sahf East Winnah

i dont look like your average hortifuckingculturist

[True Blue]

While we're on the subject... I've got a combi boiler system and lately the pressure from my hot water tap has all but disappeared. Also I have to run the tap for ages (4 to 5 minutes) till the water heats up. Once it's going the water is roasting though. Any ideas.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[it really is that quick]

[it really is that quick]

[True Blue]

No, it doesn't always fire up when the tap is opened. It's as if it's not detecting the drop in pressure of the tap opening.(is this how it knows when to kick in?) The temperature is fine and the cold water pressure is great too.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[it really is that quick]

sounds like the flow switch is fu(ked


when tap is opened water flows through boiler and past a diaphram causing a drop in presure which moves diaphram.

daiphram is in a brass casting with a flat plate on about 2-3" round

in the centre or this casting is a little pin which should move freely with the diaphram and actuate a micro switch.

get someone to turn tap on and check that diaphram operates micro switch. if it does then its electrical either micro switch, poor connection or dodgy pcb. if the diaphram doesn't move then then its siezed give it some wd40 and hope it frees it until it can be replaced

all the best

rob
____________________
not just any short of winnah... But a Sahf East Winnah

i dont look like your average hortifuckingculturist

[True Blue]

Cheers, I'll get on to that over the weekend.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[Noggin]

Sounds like the diverter valve diaphragm is fooked...

The rubber diaphragm can perish and cause them not to make the microswitch which lights the burner. If there's a hole in the diaphragm, the water gets on both sides and prevents it from lifting the pin up to make the switch, preventing the burner coming on.


Craig G(Noggin)
____________________
Current bike: kawasaki zx12r 2002
Track bike: yamaha r6 1998
Old Bike: honda NSR 125 1998

[True Blue]

Boiler is only about a year and a half old too. It's a Vokera compact. Even if the diaphram is fooked, why is the flow rate so bad?
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[owdamer]

Seems we need a diverter valve. He fitted a new pump yesterday, but thats not entirely cured it. The pump he took out was caked in brown crap and not turning. (I saw his take it out so i know its not one he brought with him!).
At the mo the heating is partially working. there is ONE rad without a thermostat. That one is getting warm, and the one nearest the boiler is getting warm. We're just not getting heat to any of the others.
got a fan heater going in the front room to keep us warm at the mo, and i've got an electric panel heater in the bedroom for later....
just have to grin & bear it for now.

[it really is that quick]

[The Old Geeza]

[owdamer]

Limescale? no a problem here. our water is as soft as a baby's bottom. Why do you think the cotton industry was so big here!.

[True Blue]

No limescale here. Water is like Volvic. I do have those fancy pattern bits on my taps, but funnily enough not on the hot water on as it fell off. The cold water pressure is ace though and the hot water temperature is good too.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[owdamer]

Our water pressure is shite. takes forever to fill a bucket up.
if you turn the downstairs tap on the upstairs wont work..

[it really is that quick]

are all hot taps effected or just one?

what sort of taps have you got, are they fancy 1/4 turn ones (ceramic disk)? these can block really easily.
____________________
not just any short of winnah... But a Sahf East Winnah

i dont look like your average hortifuckingculturist

[True Blue]

All taps are affected, though obviously the ones upstairs are worse.
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[True Blue]

What part is it I want to check? Is it part number 3?
____________________
Past >>>> Honda NSR 125 >>>> Suzuki GSXR 600 K1 >>>> Suzuki GSXR 600 K4 >>>>Kawasaki Z1000 DAF >>>>Suzuki RMZ 250 >>>> Current >>>> KTM Superduke R 1290 >>>>

[hellkat]

Oh God, go and get a Corgi registered plumber out.

Its usually an arm and a leg, but at least you won't blow the house up, LOL.

I have fond memories of my boiler suddenly starting to go "CHUG CHUG CHUG" when I pressed the wrong button during a diagnostic voyage of discovery, one day when our hot water got fucked up. Never seen my mate Longshanks move so fast out the front door before.

And my brave bloke standing there ankle deep in water and pressing other buttons desperately like a boy with his finger in the dike, and shouting at us all to get out.

Luckily, he pressed something that stopped it chugging
____________________
Not nearly as interesting in real life.