Heating, Air Conditioning, Fridge, HVAC/Rudd not reliable.

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Question
We have a older Rudd Deluxe Efficiency. When it comes on to turn the exhaust blower comes on ,then the ignitor comes ,the gas lights.,But
Some times it dose not light the gas part. We have replaced just about every thing on it. And could have bought a new one. At this point it is working  fine. But its been doing this for years now.  When it dose mess up we turn it off 5 or 10 min. then it will go on working. Two Experts have not fixed it yet. Please help us.

Answer
Veda,
 You really didn't supply me with very much information to give a difinative answer, but I will give the best with what I have to work with.  Not knowing what parts were actually changed, when and if by a qualified technition, it sounds like the Hold part of the "Pick and Hold" coil in the gas valve is either weak or the slide is sticking.If your Ruud has has a HS-780 ignitor box and it has not been changed as one of the many parts, that would be my first guess, though.
 That is my "guess" going on the assumtion that no flame what so ever even try's to light.
 If you really want a more educated guess, I will need a whole lot more info as, an issue with a furnace that works all the time except once in a great while is sometimes very hard to find even when I am on the job and am able to meters and guages and such on the equipment.
 I would need....model and serial number, exactly what parts were changed and when.  A history of what and how long this has been happening and what and how often was it looked at and what was done each time.
 Then I need to know what the furnace does when the flame does not light?  Does it try 3 or 4 times and then just shut down or does it try 3 or 4 times and then shut down and lock the blower( thats the fan that blows air into the house) on?
and what was done each time.
 Then I need to know what the furnace does when the flame does not light?  Does it try 3 or 4 times and then just shut down or does it try 3 or 4 times and then shut down and lock the blower( thats the fan that blows air into the house) on?
 Also have you had maintenance done on any regular basis, including burners cleaned, ect.  Have any of the people that have worked on it taked and recorded inlet and outlet gas pressure?
 In summation, the HS-780 would be the first thing to look at, next a sticking gas valve, but these are but guesses and without putting meter and guages on your equipment all anyone could do in this situation is a professional guess

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john t. borgman

Expertise

I am in Portland Oregon at Ben's heating 503-233-1779. I work days, so I can only answer early in the day or later in the evening. I only answer public questions for residential equipment. I am very well versed in gas, electric and heat pumps and will only answer residential applications. I have been known the past decade or so, by my employers as the guy you send when no one can figure it out. Trouble shooting is my special. I understand the physics behind air flow, refrigerants and electricity. I understand programmable t-stats, zone controls, economizers, fossil fuel kits and the engineering thought process in the wiring and construction of residential equipment

Experience

I was lucky enough to start in this field almost 30 years ago as an installer, for a company that installed the best duct systems I have ever seen, even to this day. The best ,as far as understanding the way air really flows through a duct system, from the return air to the very last supply register . They also had great pride and the duct work was put in, not only to last 50 years, but to look exceptional. Then as I started doing service work, I was again fortunate that I found a 3 year engineering class being put on be a man that was the educational director for the Entire united states for a society called " the Refrigeration Service Engineering Society " And for the next 3 years I schooled at night and practiced what I learned during the day, a great advantage over schooling and then trying to remember it years later.. Versed in duct design manual J heat gain/loss calculations.

Organizations
Refrigeration Service Engineer's Society

Publications
I have 2 inventions that have gone through the process and been recorded at the National Institute of Standards and Technology from start to finish and thus been invited to national innovation workshops by the dept. of Commerce and the dept. of Energy. They are waste heat recovery devices that N.I.S.T approved as valid and am currently looking for marketing partners to get this product into the hands of consumers and make a BIG difference in Energy savings for every Household and Eatery and take a big bite in the the peak hours power consumption that face our Utilities companies.

Education/Credentials
factory training in Lennox ,Rheem, Ruud ,Trane, Tempstar ,Carrier, Day&Night, Payne, Bryant, Coleman, Intertherm, York, Goodman, Ultra boilers, Unico, Mitsubishi,Sanyo, Taylor, Nicewonger, Navien. Associates degree in Refrigeration Engineering. Certified with Energy Department, Check-me Program, P.T.C.S (performance tested comfort systems ), have N.A.T.E. certifications in gas, a/c & heat pump.

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