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Michael, Customer Service
Category: Appliance
Satisfied Customers: 9568
Experience:  I have been an appliance repair tech for over 30 years and will help you solve your problems.
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I have had a Baxi Solo 2 50 PF boiler for a number of years.The

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I have had a Baxi Solo 2 50 PF boiler for a number of years.The boiler operates okay for weeks/months and then goes to overheat.Sometimes I simply reset it other times I have to adjust the valve in the bypass circuit.The qualified installer has not been able to make the system reliable.Any ideas?
Also,being as I simply have to turn a switch to reset it,why does'nt the boiler reset once it cools down
Hi I am sorry to hear about that.
This is a failed main control board on the boiler.
It no longer see's when the boiler is hot enough and so it will eventually shut down on emergency safety.
All the tech needs to do is simply replace the main control board and the unit should function fine again;-)
I will stick with you in case you have any further questions.
Please rate kindly before closing this page I will still be here for you and you can contact me anytime
simply by replying to this message at no additional cost;-)
Thank you and have a great day!
Tech Michael
Michael and other Appliance Specialists are ready to help you
Customer: replied 3 years ago.

The control board has been replaced but did not solve the problem

Thank you then in that case you will need a new aquastat. It is the temperature probe that is supposed to sense the temp, it is usually adjustable, you can get either type for this model;-)
Hope that helps.
tech Michael
Customer: replied 3 years ago.

I have had a number of boiler thermostats fitted over the years but they never solved the problem

Hi just to be sure, I am not talking about the thermostat on the wall.
Im talking about the one inside the boiler.
It senses the temp of the water and turns the unit on and off according to its setting;-)
Hope that helps.
Please rate kindly and I will still be here for you no additional cost to you.
Thank you
Tech Michael
Customer: replied 3 years ago.

I am talking about the one inside the boiler

Hi in the US we call it an aqustat.
And every boiler has one;-)
If the main control was replaced and you still have this problem the answer is a failed aquastat.
I have been a furnace tech for over 35 years so I'm sure of this.
Thank you
Tech Michael