Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: weak flame in intertherm furnace
Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)
Check the gas pressure, make sure you are getting 11 to 14 PSI.
You need that after the regulator all the way to the manifold.
Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.
Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.
Posted on Jan 19, 2009
Chances are the draft inducer motor is not pulling enough CFM through the heat exchanger.
That is usually due to either blocked/clogged flue pipe/vent.
damaged, missing or dirty fan blades.
or a motor going bad.
Check those three things first, as they are the usually problem. Other than that, it would be a sticking or bad switch.
If you s-uck on the end of the hose like a straw, while it is attached to the switch and it does not pull in then you are looking at a bad switch/cracked hose issue. If it does, then you are back to the draft inducer motor or it's squirrel cage fan being bad.
These are notorious for rusting and the blades breaking off.
Posted on Oct 03, 2009
There is probably more than one limit switch. I'll have to get a wiring diagram of this unit. See if you can follow the wires from the wires from the limit switch and see if they go to another limit switch. Also you can put a jumper wire on the red wire and white wire on the unit outside and see if ti comes on.
Posted on Nov 03, 2009
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