Question about Heating & Cooling
Usually not the gas valve unless line voltage was applied to it. Millivolt systems are very touchy about connections. First check the output of the millivolt generator (thermopile) the wires for this usually go straight to the gas valve they should be one red and one white usually in a high temp fiber glass sheath. The wires will lead from the gas valve to a rod by the pilot. Test between the two wires with a meter that can read mV DC. You should have somewhere in the neighborhood of 450-600mV DC. If you do not, then the thermopile is bad. If you do, then it is either a bad connection somewhere or an open safety in the circuit. Check all of the safety devices and clean all of the connections in the unit with sandpaper. Usually for safety devices there will be a high limit on the discharge of the header, a pressure switch sensing water pressure, and a rollout switch or two in the control compartment above the burner. Good luck, I have to battle with mV systems all the time at work, usually it's just a bad connection.
Posted on Jul 03, 2008
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 22, 2011 | Heating & Cooling
Mar 25, 2011 | Heating & Cooling
Feb 15, 2011 | Heating & Cooling
Nov 24, 2010 | Heating & Cooling
Nov 16, 2010 | Heating & Cooling
Sep 16, 2010 | Heating & Cooling
Apr 15, 2009 | Heating & Cooling
Jan 06, 2009 | Heating & Cooling
Dec 21, 2008 | Heating & Cooling
Jan 21, 2008 | Bryant 462AJC021BA Air Conditioner
290 people viewed this question
Usually answered in minutes!