Boiler starting up every evening

[trazza]

Every night at about 11.30pm out boiler switches on and something starts up in the airing cupboard for about 10-15 minutes. We have an Apollo boiler and this is on a timer to come on in morning and go off mid evening.

Anyone know what is happening and whether it should be or not.

 

[Biguns]

Need a good electrician or exorcist

 

[trazza]

which is cheaper?

 

[D_Hailsham]

What time is clock set to turn the heating/hot water off at night?

 

[trazza]

8.30

 

[Biguns]

Seriously though. You say your timer is set not to demand anything at that time. But the boiler and pump are recieving 240 volts from somewhere. do you have a DVM are you comfortable working with 240 volts

 

[trazza]

No not sure what a DVM is, can you get them off ebay

Just had a thought though, could it have anything to do with our water softener?

 

[D_Hailsham]

Is there a frost thermostat, which will turn the boiler on of the temperature drops too low?

 

[trazza]

I don't think so, the heating doesn't come on, just the boiler

 

[Biguns]

Without adjusting your on-off settings (but first confirm they are as you said) adjust the clock setting to read 11.30PM and see if it comes on. If it does your timer must be at fault

 

[D_Hailsham]

I don't think so, the heating doesn't come on, just the boiler

Is the boiler actually lighting up or just making a noise?

Does the thing making a noise in the airing cupboard look anything like this?

View media item 802

 

[trazza]

Yes pretty sure its the pump making the noise. The boiler fires up, I tried to switch it off one night and the only way I could was to switch it off at the wall, none of the on off settings etc would work.

 

[D_Hailsham]

Forgot to ask, which version of the Apollo do you have?

 

[D_Hailsham]

Do you have one or two motorized valves?

 

[trazza]

It's a 15/30 30/50 65/80 one of these, as per the instructions on the boiler! Oh and its brown and white

I don't know how many motorized valves we have, is there a way of telling?