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Photograph of the outdoor safety switch for an air conditioning residential systemAir Conditioning & Heat Pump Control & Switch FAQs

  • POST a QUESTION or READ FAQs about how to find, identify, & use or troubleshoot each control or switch found on air conditioners or heat pumps.

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HVAC system control & switch Questions & Answers:

This article series explains where to find and how to use the switches and controls for air conditioning and heat pump systems.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

Air Conditioner Switch & Control FAQs

A/C Compressor control board © D Friedman at InspectApedia.com These questions and answers abour air conditioner and heat pump controls and switches were posted originally at CONTROLS & SWITCHES, A/C - HEAT PUMP where you will find a discussion of thermostats, zone dampers, and circuit breakers on air conditioners and heat pump systems.

Air conditioning and heat pump diagnostic procedures are at AIR CONDITIONER NOT WORKING

First here are some helpful A/C and heat pump diagnostic procedures:

If your air conditioning or heat pump system has lost its cooling capacity or won't start select one or more of the diagnostic articles listed below.

On 2017-06-23 by James

Have an American heritage 12 heat and air unit have had repairman out three times now they say the switch from the heat pump to the compressor is stuck they will have to replace the entire unit for 15000.00.

On 2017-06-09 by (mod) -

Thanks for the follow-up, Joyce. Do let us know what you're told as that will absolutely help other readers.

On 2017-06-09 by Joyce Moorehead

The air flow was the same as before and after inserting the filter. The filter tyoe was listed on the heat pump is the one I installed. This is a brand new system. I will call a technician.

On 2017-06-08 by (mod) - weak cold air flow diagnosis

If the air flow reduction changed immediately in response to the filter that you installed, then it's possible that you install the wrong type of filter that too much restricts air flow. Are there other air filters in the system?

Other causes of reduced air flow are listed in this article series and include things like open or crimped duct work or a ice block or frosted coil. Those are problems for which you need help from your HVAC service technician

On 2017-06-08 by Joyce Moorehead

I just had a Lennox heat pump with ac. I put a new filter in as the installer had not done so. Cold air is blowing out but minimally blowing. My home is all electric. I dont know what to do.

On 2017-04-06 by Antony

AC comporsor line image

On 2017-02-06 by Ray - My a/c compressor continues to run even after thermostat is turned to heater.

My a/c compressor continues to run even after thermostat is turned to heater. The blower motor works fine and it shuts off like a normal cycle so I don't always think to check outside to see if the compressor is still running. When I do, and it is, there is ice on the tubes going under the house

. I replace the filters every 90 days religiously. In fact, New filters went in yesterday. Heater at night, a/c in the afternoon... have to love New Mexico weather. Compressor only shuts off when I cut power at the switch outside. I replaced the motor run capacitor 4 years ago and then again last year. 4 years ago the a/c company sent a guy to check (free) to make sure everything was working right. He said he would only charge me if the freon level was low, which of course he claimed it was.

Last year I did not call the company and just changed the capacitor & cleaned the coils (both sets). Anyway, can you help figure out why compressor outside will not shut off & ices up?

The heater and a/c were replaced in Aug. of 2006. Made by York and is a 4ton unit (too big, damn salesman). When everything works right, it is great, but my electric bill is outrageous. Should I consider another replacement unit or just hire a different company to do a service call?
Thanks for any help you can give me.

On 2017-01-22 1 by John - the repaired PSB has been working great no problems

Just a quick update the repaired PSB has been working great no problems. Now that I know the cause I will be checking it annually. Adrian suggested dielectric grease on the lugs may help.

On 2017-01-13 by (mod) -

John,

Thanks for the feed-back and added follow-up. It's particularly important to document the copper-to-aluminum problem that you found. This hazard has long been known in house wiring where connecting copper to aluminum as a "fix" for the aluminum wire hazard requires special connectors. (Summarized at https://inspectapedia.com/aluminum/Aluminum_Wiring_Summary.html_

It's also particularly tough to find someone who can and will work on existing circuit boards. Good going. If your repair person at Batron wants to be identified with contact information have them let me know by email to our CONTACT link at page top or bottom of any of our pages.

On 2017-01-13 by John

Well, I lucked out Baytron (on thw Web) was able to fix it and this what the problem was.

York in their infinite stupidity made the circuit board with aluminum lugs attached to the board. The heavy copper wire from the breaker panel attaches to these lugs which supplies power to the circuit. Dissimilair metals- the aluminum corrodes over time resistance builds up (heat) which melts the soldered lug of the PSB.

Adrian at Bayton could not have been more helpful (great guy) was able to attach a copper lug to the PSB resoldered it.

Just installed it and everything is working fine. Anyone who may have a similar problem let me save you the trouble of finding a replacement for part# 03101212700 there just aren't any around, been out of prodution since 2010 and no replacement. Baytron saved me thousands of $ otherwise I would be replacing a perfectly good system over a $150 part.

On 2017-01-13 by (mod) -

John

Thanks for the follow-up; do let me know what happens as what you learn will help other readers too.

On 2017-01-12 by John

Thanks for the info I have searched every where for this part and no luck.

Though there are some web sites that say they have it but further investigation the companies are scams take your money and run I will give Frank Switzer a call. I found a company Baytronics who said he might be able to repair the circuit board #03101212700
that appaers to be my only hope at this point if Frank does not have a solution.

Still can't believe York would screw their customers like that. Will never buy a York product of any kind again

On 2017-01-10 by (mod) -

John

It is indeed frustrating when a component fails and nobody provides a replacement, forcing you to replace a much larger assembly or even an entire device.

A problem is that nobody wants to accept the very serious safety/fire/injury liability of promising you that it's ok to in essence modify a manufacturer's original design.

Another problem is that the number of people who can work on and repair old circuit boards has dwindled to almost nobody. I recently spoke with the company who purchased Sonic Frontiers, a manufacturer of excellent tube amplifiers, to discuss possible repair of a bad circuit board in that amp. The technician at the new owner burst out laughing. "A TUBE amplifier?", he guffawed. "We don't have anybody here who even knows what that is."

On rare occasions you might find a local electrical engineer hobbyist who is interested in trying to fix an old circuit board but it's doubtful.

Sorry. If York isn't going to offer help and if you can't find a used but working board to replace the control module in your heat pump you're sunk.

But before giving up, do some online searching for "York Heat Pump Replacement Circuit Boards" - you'll find several vendors who say they have parts.

Give a call to

Frank Switzer Owner and HVAC Technician

715-839-0934
Toll Free 1-877-839-5565
Air Dynamics Heating & Cooling, LLC
The Heating and Cooling Warehouse
1501 Nicholas Dr. Eau Claire, WI 54703

As he lists several replacement control module boards for York HVAC equipment, one of which might work for you. You can tell him we sent you but note that InspectAPedia is an independent publisher of building, environmental, and forensic inspection, diagnosis, and repair information provided free to the public - we have no business nor financial connection with any manufacturer or service provider discussed at our website.

Watch out: some HVAC parts vendors WASTE YOUR TIME by listing at their website lines like "Replacement for York Circuit Board 03101212700" but when you actually look at the vendor's web page for that part they thumb their electronic nose, saying "Obsolete part, no longer available" - which makes me wonder why they listed it.

On 2017-01-10 by john - need a York heat pump control module replacement that York no longer provides

I have a York heat pump the control module #03101212700 (circuit board) the is bad unfortunately York stopped making the part in 2010 no replacement.

Question has any one found a obard they could wire in o make the air handler work. The board controls the blower and heat strips during heat cycle and blower during AC cycle. wWithout this part te whole system will have to be replaced for $150 part

On 2017-01-12 by John

Thanks for the info I have searched every where for this part and no luck. Though there are some web sites that say they have it but further investigation the companies are scams take your money and run I will give Frank Switzer a call.

I found a company Baytronics who said he might be able to repair the circuit board #03101212700
that appaers to be my only hope at this point if Frank does not have a solution. Still can't believe York would screw their customers like that. Will never buy a York product of any kind again

On 2017-01-10 1 by (mod) - how to fix a bad HVAC control board that can't be replaced

John

Yeah I am troubled by this sort of problem too - a component fails and nobody provides a replacement, forcing you to replace a much larger assembly or even an entire device.

A problem is that nobody wants to accept the very serious safety/fire/injury liability of promising you that it's ok to in essence modify a manufacturer's original design.

Another problem is that the number of people who can work on and repair old circuit boards has dwindled to almost nobody. I recently spoke with the company who purchased Sonic Frontiers, a manufacturer of excellent tube amplifiers, to discuss possible repair of a bad circuit board in that amp. The technician at the new owner burst out laughing. "A TUBE amplifier?", he guffawed. "We don't have anybody here who even knows what that is."

On rare occasions you might find a local electrical engineer hobbyist who is interested in trying to fix an old circuit board but it's doubtful.

Sorry. If York isn't going to offer help and if you can't find a used but working board to replace the control module in your heat pump you're sunk.

But before giving up, do some online searching for "York Heat Pump Replacement Circuit Boards" - you'll find several vendors who say they have parts.

Give a call to
Frank Switzer Owner and HVAC Technician

715-839-0934
Toll Free 1-877-839-5565
Air Dynamics Heating & Cooling, LLC
The Heating and Cooling Warehouse
1501 Nicholas Dr. Eau Claire, WI 54703

As he lists several replacement control module boards for York HVAC equipment, one of which might work for you. You can tell him we sent you but note that InspectAPedia is an independent publisher of building, environmental, and forensic inspection, diagnosis, and repair information provided free to the public - we have no business nor financial connection with any manufacturer or service provider discussed at our website.

Watch out: some HVAC parts vendors WASTE YOUR TIME by listing at their website lines like "Replacement for York Circuit Board 03101212700" but when you actually look at the vendor's web page for that part they thumb their electronic nose, saying "Obsolete part, no longer available" - which makes me wonder why they listed it.

On 2017-01-10 by john

I have a York heat pump the control module #03101212700 (circuit board) the is bad unfortunately York stopped making the part in 2010 no replacement. Question has any one found a bard they could wire in o make the air handler work. The board controls the blower and heat strips during heat cycle and blower during AC cycle. wWithout this part te whole system will have to be replaced for $150 part

...


Continue reading at CONTROLS & SWITCHES, A/C - HEAT PUMP or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES.

Or see ELECTRICAL POWER SWITCH FOR HEAT

Or see CAPILLARY TUBES

The main operating controls for HVAC systems and their functions are are discussed at OPERATING CONTROLS, A/C & HEAT PUMP where you will find a discussion of thermostats, zone dampers, and circuit breakers on air conditioners and heat pump systems.

Other air conditioning and heat pump diagnostic procedures are at LOST COOLING CAPACITY.

Or see this

Article Series Contents

Suggested citation for this web page

A/C HEAT PUMP CONTROL / SWITCH FAQs at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

INDEX to RELATED ARTICLES: ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS

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