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Delonghi model duh500l shuts down when both switches are on, have to unplug for awhile to come back on.

When sw#1 is on, all ok. when sw#2 is turned on, after awhile heater shuts down. have to unplug awhile for it to come back on.

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Posted on Jan 02, 2017

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SOURCE: troubleshooting reddy heater 115,000btu

Remove the nozzle and clean it. Clean the photo cell also. Check the fuel pump pressure it should be 5.1 #.

Posted on Mar 06, 2008

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  • 1 Answer

SOURCE: troubleshooting reddy heater 115,000btu

runs for awhile shuts down with a big puff of smoke comes out poured diesel 911 thought i had water in diesel fuel cans nothing help need solution ASAP

Posted on Jan 18, 2009

  • 1 Answer

SOURCE: unit shuts down after 1 or 2 min.

Yeah, I've got a solution. SHUT OFF YOUR GAS SUPPLY VALVE FIRST!!! If your pilot won't light or if it lights and kicks off soon then check the orifice. I've got a 30,000 BTU LP gas unit. when my pilot did light, the flame was not totally encompassing the thermocouple nipple which lies behind the sparker/igniter furthest away from the flame. It cause the thermocouple nipple to cool too much and shut off the unit. I took the unit off the wall. I undid the four screws on the back of the unit, which holds the glass front plate. Then I took apart the multi-sectioned brass piece that is attached to the gas feed line for the pilot with a 13 mm and a11mm open end wrench, or you can use a small adjustable and a set of pliers. The second brass piece, the 11mm one, from the gas feed line, is the orifice. It has a tiny little hole in the center. I stuck a pin in it and cleaned it out from some debris that had clogged it. You do not have to take off anything else but those two pieces going from the gas feed tube. I put it all back together and I'm back in business. Now if you do this and it still doesn't work, buy a new thermocouple. They're cheap. Somewhere between six and ten bucks last I looked, Honeywell makes them and they fit most gas units besides Glo-Warm. Have a nice Day. Cadge

Posted on Dec 01, 2009

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Get heat for awhile then the furnace shuts down.


Great this is good information. I believe it to be one of two issues.
1) The thermocouple (rod that sticks into the flame) is dirty. You can clean this with some steel wool or light sandpaper.
2) If solution #1 does not work then I will say that we have a faulty gas valve (assuming that the gas content and pressure into the house are ok). These are usually pretty generic and can be purchased at your local Grainger (or the like) supply house. Make sure that you are familiar with all of the components involved and read the directions before you remove the old one. If you are not comfortable with this task PLEASE call a licensed technician over. Thanks and good luck!

Jan 27, 2009 | Heating & Cooling

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runs for awhile shuts down with a big puff of smoke comes out poured diesel 911 thought i had water in diesel fuel cans nothing help need solution ASAP

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