Boiler cutting off all the time

[JBart]

Hello all,

My boiler is a Myson Apollo 40Si about 10 years old. My landlord serviced it almost 2 years ago. Because of the cold weather I changed the thermostat to high. The water came out really hot and the radiators are hot too. The only problem is that the boiler on off cycle (fire, re-fire) is about 20 seconds!!! i.e. is working for 20 seconds, stops 20 seconds and refire again and so on... Is this normal? It has been always like that and I was using it in low, but now with the cold I had to change it to high. I think I'm wasting too much gas and imagine if I have my boiler on all night with this short cycles.

Can anyone give me a hint of possible problems?

Thanks for your help,

JBart

 

[D_Hailsham]

My boiler is a Myson Apollo 40Si about 10 years old. My landlord serviced it almost 2 years ago.

Probably nearer 20 years old!

By law, the landlord has to have the boiler checked every 12 months. You should be provided with a copy of the "Gas Safety Record" Certificate.

It's the landlord's responsibility to maintain the boiler and get the problem sorted. It's not a good idea to try and fix it yourself as the landlord could easily say you have caused the problem.

It could be a faulty thermostat, which needs a Gassafe Engineer to check and replace.

One thing you can check is the pump speed setting. It should be on 3.