my in wall heater is shutting down due to a cloged flute how do i clean this?

Answer 1

Dont be so sure its a clogged flue. More than design combustion of gas due to higher supply to burner acts the same way.

I think it is an increase in gas pressure at that regulator inside the gas valve itself. To fix this, you will see a screw Cap, on the side of the gas valve. Remove that cap, deep inside of that you will see a screwdriver slot. If that is a Honeywell regulator, turn that screw 1/4 turn COUNTERCLOCKWISE. That will reduce the gas flow to the burner and probably will solve your problem.

Same thing happens on a furnace or boiler where the code indicates "flash back" Its too much gas supply. Those small regulators built into those gas valves do need attention at regular intervals. A skilled tech would set that flow rate using a "U" baramoter pressure gage, but you can probably solve that problem of yours simply adjusting as above.

Answer 2

If you can get the flue loose inside the house where it is attached to the furnace then remove part of the flue and look up in it for an obstruction. If you find it is stopped up then you can get on the roof and tie a rope onto something that will fit down your flue pipe. Depending on your flue size maybe a rock or brick will fit, Tie a long piece of rope to object and drop down flue to see if this will break up you clog. You can also buy and maybe rent a chimney brush. Once you get the debris loose you should be able to clean it out where the flue goes into the wall furnace. If all else fails there are company's that have big vacuums that they use for cleaning duct work and flues. Good luck.