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fp1 02-07-2007 01:34 PM

Boiler heating sounds....
I have a Netaheat 80E Serial No. 06325 gas boiler (Potterton Int, made in UK I think). It continuously is making screeching and grinding noises and I seem to hear switches coming on and off repeatedly. It will make the screeching noise (sounds similar to a car fan belt going or something like that) for a while, then shut off and seem to work normal, then shut off completely for an hour or so. The hot water to the faucets and shower is fine but I can't feel any heat in the base registers, yet the thermostat says it's always between 69-72 no matter if I try to lower the temp or not. It isn't exactly cold in the condo.

This is a unit for a condo, which I just bought, and wouldn't you know it a few days after closing, these awful sounds start happening. I presume the unit is original to the condo (around 1987 or 1989). Any advice on what these sounds might be or what to do would be very welcome.

I fear the worst, as in a replacement might be necessary. If so, I'd also welcome any suggestions on what type of gas/heating boiler would be best. I shutter to think of what the costs might be.

redline 02-07-2007 01:47 PM

Can you post a photo of the boiler?
It sounds like the pump or motor for the pump is in need of repair.

fp1 02-07-2007 02:12 PM

Picture 1

fp1 02-07-2007 02:15 PM

redline 02-07-2007 02:26 PM

Are you sure that unit is not just for hot water to the faucets?

Do you have a seperate unit for heat?

Is there a seperate heating unit to heat up the entire building?

fp1 02-07-2007 02:37 PM

no, that is it ( i have roughly 800sq ft). the noise is coming from the unit above the hot water heater, located in the white housing unit. i have the typical baseboard/copper pipe with fins running the living room, bedroom and a small one in the bathroom. I can't really fell any heat through the baseboards.

in another closet, i have the central AC unit, carrier unit. there is nothing else. each condo has its own heating/cooling system.

i can 'control' the heat and AC from the thermastat, though I'm not positive how accurately it is working.

you can see the metal name plate of the unit and it states it is a gas boiler, serial no, btus, etc.

tvlfleming 02-07-2007 02:41 PM

Sounds like a bearing for the circulation pump or blower motor is on its way out. Take a long screw driver or rod and hold up to your ear and the moving parts when noise occurs. The noise will telescope threw the rod so you can determine where it is coming from.

tvlfleming 02-07-2007 02:43 PM

Have you opened the white cover?

fp1 02-07-2007 02:45 PM

I can't open the white cover. It is stuck on there something good. Also, I'm a little scared to rip the thing off, not knowing a whole lot of HVAC.

The noise is coming from just above the the little hole where you can see the pilot light and or burner when the unit is running.

tvlfleming 02-07-2007 02:48 PM

Well I would have to say blower motor, the circulation pump is the red round valve below the white bow right above that gray tank {expansion tank}.

fp1 02-07-2007 02:55 PM

can a blower motor be replaced?

Is it cost prohibitive?

tvlfleming 02-07-2007 02:55 PM

If your not comfortable with working on it than best bet is to get a HVAC man in cause thats hot water and electricity. Not a good idea to mess with if not familiar. Good Luck.

tvlfleming 02-07-2007 02:57 PM

Sure it can. Probably couple hundred dollars plus good old labor charge but better than total replacement.

redline 02-08-2007 06:09 AM


Originally Posted by fp1 (Post 32716)
the noise is coming from the unit above the hot water heater, located in the white housing unit.

in another closet, i have the central AC unit, carrier unit. there is nothing else. each condo has its own heating/cooling system.

It appears that this unit is for your heat. I noticed that there is the circulation pump (red) indicating it is for the heat.

I would also think that this unit also heats up the water for the hot water tank.

When the unit comes on for the hot water tank does it make the strange noises or just when the condo is calling for heat?

The noise is coming from this unit and not from the a/c unit in another closet - is this correct?

fp1 02-08-2007 07:33 AM


The noise comes from the boiler unit whenever it heats up water. it can be right after a shower, running the faucet, etc. Or it can occur randomly throughout the day/night, which I presume is when it is calling for heat.

No noise is coming from the AC unit as it is located in another closet about 20ft away from the boiler unit.

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