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Banging while heating - Bunn NHB Coffee Maker

Posted by Terry Michael on


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My Bunn has a minimum water pour in amount at 4 cups mark on the pitcher. They more or less boil the water so if you are trying to make less than 4 cups thats not a good idea.Other wise yes they are a little noisy. It may help to use only filtered water as the solids in tap water may be restricting (solids build up) water flow.
I hope this helps you.

Posted on Oct 15, 2009


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Heat-glow 6000tr oak lpl My pilot goes out or becomes very little and when it does light a big bang sound?

It sounds like you are using a natural gas fired heater and your fuel is propane. If this is the case, you need to buy a propane conversion kit.

Mar 17, 2017 | Heating & Cooling

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Model h100id banging noise when turned on shuts off

VERY low water flow!
Or... No water flow.
This heater as all heaters do, need to have sufficient water flow thru them, or else they Bang like this.
This then creates a problem, for future banging - due to lime up!
The minimal water flow gets so Overheated, that it turns to steam! The steam knocks and pushes the heater around, then the Minerals will precipitate out of the water and forcefully attach to the inside walls of the heat exchanger! Which will then drastically reduce the inner diameter of the exchanger making a much smaller passageway for water to travel thru! This is a major problem to remain this way. It will then need to be dismantled and de-limed to increase the holes once more, and allow a proper water flow.

May 30, 2015 | Hayward 100,000 BTU Pool Heater H100ID1 -...

1 Answer

Heater wont stay on banging noise

Banging noise is never a good thing on a heater!
  • Very low water flow thru heater
  • Calcification of internals / heat exchanger
  • Liming of internals in heat exchanger
Steam used to move giant monsters of a train across country, you have steam being generated in your heater, that's causing the bang and probably some rockin' & rollin' of the heater itself?
You should probably have a service tech look at it.

May 29, 2015 | Pool & Spa

1 Answer


There are two things that can cause this...
low water flow
mineral build up in heat exchanger

Check and verify water flow through the heater

if that is ok, then the heat exchanger needs to be cleaned


Sep 25, 2011 | Hayward H-series Electronic Gas Pool...

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I have a aircond / heat pump unit. When in the heating mode it run for about10-15 minutes and you hear a small bang and here a rush of pressure in the aircond lines and the the unit seem to be running in...

Hello,Your heat pump is in DEFROST mode and this is normal(only during a call for heat).When in defrost mode the supply air temp should still be warm as 1st stage electric heat strip comes on during the cycle.If the unit did not defrost every once in a while the outside unit would look like a snowman after a while.The reversing valve is the "bang" when it changes over.

Oct 27, 2010 | Coleman Heating & Cooling

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