Ruud Furnace - Intermittent Problem

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Old 11-08-14, 11:29 AM
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Ruud Furnace - Intermittent Problem

Ruud Silhouette II Furnace installed about 1999 (we bought house in 2005). We do NOT have a manual. A/C works great-no issues. We leave fan running 24/7/365. Problem: Last year and this year when we start needing the furnace to run more and more, we have an intermittent issue that when the thermostat calls for furnace to come on around 6 a.m. it kicks the fan off and nothing happens-dead silence. (We are use to the soft, white noise the fan makes). It is odd that this occurs at almost the same time each day. Go downstairs to the unit and turn the power switch off on the unit and wait a few minutes. Flip switch back on and unit will work normal for next 24 hours. Downstairs on the unit the first green light is on. Going to the left, the next light is blinking. We have worked with the thermostat and it does not appear to be the issue. Do we need to clean the flame sensor again? Any ideas or suggestions for us to try? Thank you!
 
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Old 11-08-14, 12:16 PM
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What is the model number of the furnace? On the inside cover of the furnace should be a list of the fault codes.
 
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Old 11-09-14, 07:05 PM
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Ruud Silhouette II Furnace Model # RCBA-3765GG17XI. The OK light (second from the right) is the one blinking. We'll have to watch and count how many times it blinks. Would turning the power off to the unit reset the pressure switch if that is what the problem is? Thanks for your reply!
 
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Old 11-09-14, 08:55 PM
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Turning the power off won't effect the pressure switch. The combustion blower is what closes the pressure switch.

That model number is for the evaporator coil. Check inside the furnace for the model number.
 
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Old 11-10-14, 05:01 PM
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The model # is UGPH-07EAUER, 75,000 BTU Furnace.
 
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Old 11-11-14, 03:43 PM
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Unit did it again this morning and the OK light just blinks. There is no pattern. It just blinks until the power switch is turned off. When the power is turned back on, the unit continues working until the next time.
 
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Old 11-11-14, 04:06 PM
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When the power is turned off and back on does the led stop blinking? Is the combustion blower starting first? Does the furnace blower start?
 

Last edited by skaggsje; 11-11-14 at 04:08 PM. Reason: spelling
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Old 11-11-14, 04:59 PM
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Yes, that's correct. Thanks.
 
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Old 11-14-14, 04:47 AM
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Woke up at 6 am and furnace was off and it's 24 degrees outside. At 6:25 am it shut off again. Usually it does it once per day and we have gone two days this week without it shutting off at all.

Since we are going to be in the midst of this artic blast for a while and will be in and out of the house a lot, we are giving up on the DIY and calling in the pros today. We can't take a chance on the heat being off for long periods of time and being gone. Thanks!
 
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