Hi all,
Can anyone offer a though as to what the buzzing noise in my Powermax 155x might be please?
Basically, if the boiler starts up from cold/warm (e.g. after being off overnight), then over the course of about 5 mins a loudish buzz develops that can be heard around the house. If the boiler kicks in from being recently on (i.e. is warmer to start with) then the buzz starts much quicker / almost instantly. Thermal expansion and two interfering parts I perhaps hear you cry! Well, that's what I thought, but I don't believe it so (at least not the prime cause). Here's why....
Any thoughts please good and knowledgeable people?
Many thanks.
(Disclaimer for the nervous types out there.... I'm an aircraft engineer, so am more than comfortable tinkering and fixing equipments / components that have gone wrong. But I'm not a gas engineer and won't tinker with the gas side of the system if that's what we think it may be. I'm just not the type to fork out for service visit, without concluding I can't fix it first. So there )
Can anyone offer a though as to what the buzzing noise in my Powermax 155x might be please?
Basically, if the boiler starts up from cold/warm (e.g. after being off overnight), then over the course of about 5 mins a loudish buzz develops that can be heard around the house. If the boiler kicks in from being recently on (i.e. is warmer to start with) then the buzz starts much quicker / almost instantly. Thermal expansion and two interfering parts I perhaps hear you cry! Well, that's what I thought, but I don't believe it so (at least not the prime cause). Here's why....
- Buzz sounds about 50Hz-100Hz ish to my untrained ear.
With the front Lower and Upper covers removed it definitely sounds like it's coming from the top end somewhere. Fan area or behind that.
- If the boiler has been on recently and is thus warm, the burner doesn't kick in instantly (as the store is warm of course). So if I start either the C/H or turn on H/W, then I hear those respective pumps running - near silently. It's not those.
When the stat kicks in to trigger the burner to top up the heat, first of all the Fan starts up... still no buzz, so it's not seemingly that either. HOWEVER about 5s after the Fan has kicked in the Burner is triggered, and it is then when the noise INSTANTLY appears. No delay, not even a couple of seconds. Burner light ON = top end buzz. I can manually turn the system on / off by the switch and the buzz comes / goes in direct relation to the Burner activation / deactivation - irrespective of all other pumps / fans.
Any thoughts please good and knowledgeable people?
Many thanks.
(Disclaimer for the nervous types out there.... I'm an aircraft engineer, so am more than comfortable tinkering and fixing equipments / components that have gone wrong. But I'm not a gas engineer and won't tinker with the gas side of the system if that's what we think it may be. I'm just not the type to fork out for service visit, without concluding I can't fix it first. So there )