Apollo 40 Si

[Dior]

Hi

I would like some help if possible with my boiler. Currently i am without any hot water or heating and as a umemployed mother of 3 i cannot afford to call out an engineer so thinking of doing it myself

Every time i switch on my boiler,,, it switches on as normal and lights up...ater a few seconds ther is a rumbling and thn big bangs at which point i switch it off!!

I have been told by a friend tht it sounds like the water has run out... and just to twist the water switch anti clock wise.BUT i can't locate the switch!!

Wht do i do?

any help will be greatly appreciated.

 

[twgas]

most apollos are fitted to open systems as sealed systems were not the norm when they were being installed. try locating the header tank (usually the smaller of two tanks in loft, look to see if there is any water in, if not release the ball valve by wiggling up and down and it will refill system.
then you need to bleed rads and possibly coil of cylinder.
if header tank has water, approx 2 or 3 inches your problem could be dead pump.

 

[petit_pablo]

Im going to go for pump here.

 

[twgas]

did mention pump, better to check header tank first though, possibly save time and money.

 

[petit_pablo]

did mention pump, better to check header tank first though, possibly save time and money.

I did see that, just hedging my bets lol!

 

[Dior]

thank u for the prompt reply... too chicken to go check the loft at night!!

Will check in the morning,so...how much will a pump cost???

 

[D_Hailsham]

Could be the pump over-run thermostat is u/s. I had similar problems which were cured when I replaced the stat.

Check the header tank, as explained earlier but, before you replace the pump, check if it is working. The easiest way to do this is to put the sharp end of a long screwdriver against the pump and the other end against your ear. If the pump is working you will hear a rumbling sound.

You need to check if the pump works when the boiler lights up and when it goes off. Use the boiler HI-0-LO switch to turn the boiler on/off, not the switch on the wall as this will stop the pump completely.

Set the switch to HI or LO and listen to the pump. Then set the switch in the middle 0 position. The boiler will go out but the pump should continue to run for about 5 minutes then stop. This is the pump in over-run. (You really need two people; one to turn the boiler on/off, the other to listen to the pump.)

If you can hear it in when the boiler is on but not when it is off, or vice versa, the overrun thermostat is dead. But, if you can't hear the pump when the boiler is turned on then off, it could be either the pump or the overrun stat.

The only way to confirm this would be to run a temporary mains connection to the pump, bypassing the overrun thermostat and see if the pump then runs.

 

[twgas]

Set the switch to HI or LO and listen to the pump. Then set the switch in the middle 0 position. The boiler will go out but the pump should continue to run for about 5 minutes then stop. This is the pump in over-run.

this is not the pump over-run. the pump over-run operates when timer or both of cyl/room stats turn off,

 

[D_Hailsham]

Set the switch to HI or LO and listen to the pump. Then set the switch in the middle 0 position. The boiler will go out but the pump should continue to run for about 5 minutes then stop. This is the pump in over-run.

this is not the pump over-run. the pump over-run operates when timer or both of cyl/room stats turn off.

Of course, I should have referred to the wiring diagram, not relied on my memory.

To the OP:

Replace the para quoted above with:

Turn the boiler on using the timer and room stat and listen to the pump. Then turn the boiler off using either room stat or timer and listen to boiler. It should continue running for up to five minutes.

If you have a cylinder stat turn this right down while doing the test.