Valliant 837 ecotec plus fault code f24

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Hi, I have the above boiler and the above fault code keeps coming up and stopping the boiler from time to time. Its not a great issue but im worried that it will damage the boiler. When i re-start the boiler after the fault code, i notice the pump struggles with a series of short grinding sounds. I also noticed there is a tiny leak between the magnatec and the pump (not sure if relevant). I have bled the pump to no avail, the rads are bled too. I had the setup serviced less than a year ago, the plumber i used didnt have a diagnostics kit so he suggested to use valliant, which im loathe to do as id rather use and maybe re-use a loacal plumber. So in short have any of you guys got an idea and can you recommend a solid plumber to look at the issue.

regards

Ben
 
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I would pullt the pump off and make sure theres nothing stuck in it before making expensive call outs.
 
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F24 is because the temperature of boiler is rising too quickly so may well be related to pump.

I would also suggest rather than a plumber you engage the services of a competent local boiler engineer who should be able to diagnose problem.

the plumber i used didn't have a diagnostics kit so he suggested to use valliant
Now that is cr@p because this boiler has perfectly adequate inbuilt diagnostics to diagnose this problem.
 
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