The gas meter regulator setting is not set properly. I found "W2" on the Thermostat Terminal Block!! PV/MV on the valve is common. Also, I would check sequence of operation, if this is a new problem, or if this is a condition that has existed since the furnace was installed. You can lock your system in low fire from just switching a dip switch on the control board to see if it will work with low fire only. Get your answers by asking now. The gas valve opens, has good pressure, and when the gas shuts down I lose the 24 volts so the valve so it’s good. M#YSD150F3RHA04000/ S#15021058D When I tested unit in heat it started up went through its step and when the gas valve was energized it started chattering really loud. I've spent the last 5 hours diagnosing why it won't light, and everything checks out fine until you get to the gas valve opening - voltage goes from 0 to maybe 2v at the most before the furnace kicks off and restarts the cycle. Even thou I check the ground connection in the furnace … If you are getting 24 to 28 volts between the W and C terminals then your thermostat and thermostat wiring are in good shape and doing what they are supposed to be doing. A good portion of the controls are actually inside that gas valve and it will have multiple wires going to it. I ran into to this just once this past heating season, if you tap the valve while its sparking I'm guessing the pilot valve will open given its getting 24 V. Note: on the valve. report. I do not know if there is a "restriction" in the 2nd stage pressure switch causing it to fail to close. I work in controls, but agreed to take a look at my sister's furnace. November 28. EBEBRATT-Ed said: That will work hope the furnace doesn't have a shorted gas valve. If the voltmeter reads line voltage with the burner on for 2-3 min, the control has failed. The gas piping is not capable of supplying sufficient gas (Small Diameter Pipe). Why does my landlord keep turning the hot water heater down? I hooked it up to make sure it didn't do the same thing. 50% Upvoted. 29 In. Read detailed information? The inducer motor ramps up for high fire if the 2nd stage pressure switch fails to close(do to restriction) the furnace will shut down. Electric furnace thermostat control wire. I was talking about the exhaust vent on the furnace. If you have a gas furnace, one of the valves may be failing. and PV obviously is for the pilot, and MV is for the main valve. what are the best pliers for a hose clamp? Its kind of shocking the new valve didn't work, but I'm not completely suprised - I've put new parts in before that didn't work as well and it really messes with ya, so I feel ya. The gas valve is getting 15 VAC closed and 28 VAC when it should open. You may have the gas **** off on the furnace or gas valve itself off(some gas valves will not allow pilot gas to exit with the valve on "off"). When the furnace operates with no fan, the limit, on the right side of control with red wire on top and black on bottom, should shut off the burners after about 5 minutes. A friend of mine told me that I could hook 2 12 volt dc batteries together in series to get 24 volts, and that the 24volts of dc power would open the gas valve. 5. manifold pressure. If you have 24 vac to the brown wire (stage 1 heat) while the igniter is glowing and no ignition and there is gas to the inlet side of the gas valve then the gas valve is suspect. Furnace Gas Valve Replacement Furnace Gas Valve Not Getting 24 Volts Different Types Of Furnace Gas Valves Trane Gas Valve Replacement Cost Carrier Furnace Gas Valve Replacement. Gas Valve Troubleshooting - Gas valves used in a modern state of the art residential gas furnaces are typically controlled via a state of the art electronic ignition control or a printed circuit board. d. Both a, and b are correct. That will work hope the furnace doesn't have a shorted gas valve . I have an American Standard Furnace Freedom 80 Comfort-R. Did you look at the fault light on the furnace to see why it was faulting out? Ultimately, the thermocouple acts as a safety mechanism that prevents gas buildup within the home. T-Top Posts: 1,871, Reputation: 100. The main gas valve solenoid chatters or rattles for a split second before it stays engaged after the pilot is proved. The side that says line will be 120 volts The side that says load should be 24 volts. Log in or sign up to leave a comment Log In Sign Up. If so and the valve does not open the gas valve is bad. So I replace the ignitor with new and exactly the same result. b. I have many details but no answers :-(. The same problem still exists. If not, I'd look for some notes about how many amps the HSI draws. I'm servicing a Crown gas upflow furnace, model#MDA100NH4R with a call for no heat. On an Intermittent Pilot type of ignition system on a furnace, the pilot wont open. Yes ED, that is possible. December 15, 2011. Millivolt gas valves do not require external power source. Do you have other appliances that use gas in the house? A stuck valve could release gas into the air without regulation or the valve could cause the unit not to fire up at all. Furnace gas valves cannot be repaired. • 24 Volt, 120 Volt, and 240 Volt – Combines a manual main and pilot gas valve, a separate automatic safety pilot valve, pilot filtration, and automatic electric valve. Lennox Furnace Won't Open Gas Valve I have a 3 year old Lennox ML 180UH with control board 103085-02. Still have questions? Sort by. Tested from Common terminal to ground, and got no voltage reading. I have a carrier 58gs100ga furnace with a white rodgers 36e93 gas valve. I'm not a certified furnace installer or repair person, so I don't actually know if it's even possible to put a valve on backwards, so, the question. b. Ask Your Own HVAC Question Customerreply replied 2 years ago daz that mean a new valve or is there a way to fix it I took the pilot tube off the valve and tried it (thinking the pilot or tube could be plugged, but there was still no gas coming out of the pilot tube hole connection on the gas valve (while the igniter was sparking). The "lo fire" 1st stage solenoid ALWAYS gets 24v after pilot light is on for 20 seconds. Hold each tester wand on the multimeter to one of the terminals on the gas valve. When I tested the voltage with my multimeter, I got 24 volts going to the gas valve at PV after the prepurge cycle of the ventor motor and when the igniter started sparking. I think you will find that one Bobice. If I don't get 24V to the gas valve when the igniter glows, then the problem is the wiring/control board/ground, correct?? Gas valves can be found on gas furnaces, gas fired steam boilers or hot water boilers, and gas-fired water heaters. The GMPs are pretty straightforward. Ultra Member : Apr 5, 2008, 04:58 PM Two things you need for sure on a gas furnace 24v. Alma Kelley Valves June 08th, 2019 - 13:11:36. It is dificult to diagnose this without more info, and possibly some tests.

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