Question about Ruud UBHC Air Conditioner
I have a ruud heater and at times the ignitor doesnt come on, which means the gas doesnt come on and the furnace doesnt light. when the thermostat turns the blower fan on it continues to run and doesnt shut off. this problem was intermittent but seems to be happening all the time now. whats really strange about it is that if i go to the unit and turn off the power switch at the unit and turn it back on, the ignitor lights and the furance kicks on and everything is ok until the next time.
I am having the same exact problem. The furnace is 6 yrs old. It is a RUUD Acheiver 90Plus.
Posted on Mar 03, 2013
If your house was built "back in the day" when there were only 2 prong plugs you will experience grounding problems.actually...lack of ground problems.flame sensor good, at times, and other times nothing.ground your furnace at control box to the nearest water pipe using 14 awg wire.
Posted on Jan 09, 2009
Your furnace is going into a lockout condition, cycling the power resets the circuit board and it starts over. I will need to know approximate age and model of your furnace, it sounds like you have need to clean the flame sensor rod. However i need to know what i am working with.
Posted on Dec 18, 2008
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Nov 03, 2013 | Ruud Air Conditioners
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Dec 27, 2010 | Ruud UBHC Air Conditioner
1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.
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