Heating, Air Conditioning, Fridge, HVAC/Rheem RRKA-A036


I have a rheem rrka a036 heater/ac unit installed on the roof. It has recently started this problem of starting up normally and the burners shut off after about 30 sec to a minute. The indicator light flashes twice and that apparently means a pressure problem. I replaced the pressure switch but that did not do the trick, the exhaust blower is making a little noise so I am not sure if it is pulling correctly.


Not knowing the age I am going to guess 15 plus years old and the louvered panel above that exhaust is all rusty. That has a exhaust fax with a open blade system for moving the air (not a good design) and between the motor dragging all the rust and clogged up areas through that fan are the reasons you aren't making the pressure switch. You might try pulling the rubber hose on the opposite side of the pressure switch hose off the metal pressure port (nipple) and cleaning it out because it gets clogged. (don't drop whatever metal you are putting in the hole or you will have to take the whole assembly off to retrieve it) Also make sure that the pressure switch hose is not cracked or stretched on both ends. That should do the trick.

If when you push a piece of wire in the little hole and find it is clogged up you can take a drill bit that is just barely too big for that hole and auger out the hole making it just minutely bigger don't get carried away if you make it too big you will drill the rivet out that is holding that pressure port in.

Some of those "inducers" have a small plastic oil tube on top of the motor, if so, sewing machine oil works great.

Heating, Air Conditioning, Fridge, HVAC

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john t. borgman


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


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.

Refrigeration Service Engineer's Society

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.

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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