Thorn apollo boiler noisy

Joined
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Hi all

I have a Thorn Apollo 15/30b boiler which has been working fine until a couple of days ago

The boilers outer casing gets extremely hot and seems noisier than normal, I did replace a double rad a couple of months ago but made sure I bled all rads.
I am going to do a drain down anyway using sludge remover and then inhibiter because its due but am wondering if the low stat on the flow pipe is defective, I know the high and low stat control the temp.
Other than that it operates normally when heat or hot water is called for.

Any info would be truly appreciated.

Semi-acoustic
 
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If its noisy at boiler and casing getting hot it could be some insulation has fell onto burner or it is in urgent need of a service
 
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Hi namsag, BingoBongo,

Took casing off, no sign of soot or loose insulation anywhere ? seems as though boiler is working overtime.
I checked the condition of the hi and lo stats and the base of one of them looked corroded like when a dead battery is left in a torch for a year,

I gave them both a clean but will get it serviced next month so it has been turned off for now, thanks for your advice.

Semi-acoustic
 

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