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Rick I still have issue with my boiler BUDERUS G-224 It

Customer Question
continues to make the knocking...
Rick I still have issue with my boiler BUDERUS G-224 It continues to make the knocking noise inside that transfers on the pipes and radiators when the boiler is reaching the cut of temp of about 150F
What do you think maybe happening?
Submitted: 9 months ago.Category: HVAC
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Answered in 4 minutes by:
11/10/2017
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,621
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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Well with water temp well below boiling point the only other possibilities are air in the system or possibly to high water flow (pump GPM too high) and you get what's essentially water hammer when a zone valve closes.

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Customer reply replied 9 months ago
Rick I did replace last week the Amtroll expansion tank and it helped little bit. I did eliminate the zone pumps because they switch on before I start to hear the knocking it gets louder as the boiler reaches its cut off set point some of the knocking is low I hear it when I am by the boiler but then are the louder ones that travel through the pipes. .
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Do you have a separate temp gauge or are you relying on the boiler temp reading?

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Customer reply replied 9 months ago
Rick I will call you on a day when I am back at the house and next to the boiler so you can also hear what it is doing, Stan
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Ok

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Customer reply replied 9 months ago
the boiler is controlled by it own Buderus Logomatic control.
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

That's not what I asked. I asked if there is a separate external temp gauge to verify water temp. If not then the boiler temp sensor could be off and your water could be a lot hotter than you think.

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Customer reply replied 9 months ago
there is a T/P gauge on the manifold above the boiler that shows the how hot is the water leaving the boiler it is some 5 feet away.
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Ok

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