Question about Heating & Cooling

1 Answer

Unit no longer heats

Had Friedrich PTAC installed with new room addition. Model PDE15K55B-D. Serial No. LFMM01343. Installed May 2007.
Air and heat worked great until last week, then heat quit. All else
seems ok.
Accessed the error code per the manual and it comes up 11. No
other codes displayed.
The intake and exhaust screens are clean with no obstructions.
Just seems the heater strip is inop.
Anything I can do?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 3,422 Answers


If ur AC is not coolling properly thn u must go for replacing a fuse, resetting a circuit breaker or checking to see if the thermostat is set properly. If an electrical problem isn't the cause, the refrigerant may be low if the system still runs but does not cool properly. This can be corrected by having an EPA certified technician add necessary refrigerant. Most likely, if the problem involves any major part, such as the compressor, you would hear strange noises similar to those of any mechanical equipment not running correctly, or the unit might not run at all.

Go for replacing both theoutdoor condensing unit (which includes the compressor) and the indoor coil on my central air conditioning system at the same time
Matching a new condensing unit with a new coil is the only reliable way to be certain you are going to get the rated efficiency of the new equipment. Matching a new, high SEER (seasonal energy efficiency ratio) condensing unit with an old indoor coil probably would not result in optimum efficiency.

Dont forget to rate me as fixya..

Posted on Jan 30, 2008

  • Priya darshan Jan 30, 2008

    If the unit no longer heats then the main problem is with the heat pump..

  • Priya darshan Jan 30, 2008

    A heat pump is simply a reversible air conditioner. It has a reversing valve that allows the flow of refrigerant to change direction when the thermostat shifts from "Heat" to "Air Conditioning" and vice versa.

    A heat pump system has several other components not found in air conditioning systems. It has electric heating coils inside to provide supplemental heat during the coldest weather when the heat pump alone is not able to supply enough heat for the house. It also has a defrost thermostat on the outdoor unit to control the defrost cycle of the unit when the system is operating in the heating mode. During the winter, the system reverses itself every 90 minutes to release warmth to the outside and melt any frost or ice that may have formed on the unit.

    Factors to Consider Before Purchasing a New Unit.
    Shopping for a new heat pump or air conditioner? There are several factors to consider before making your choice.

    • Efficiency

      Heat pump and air conditioning systems are rated by the American Refrigeration Institute (AIR) on a standardized scale so consumers can compare the operating efficiency of various equipment. The Seasonal Energy Efficiency Ration (SEER) is a measure of how much electricity is used by a system to provide a unit of cooling. The higher the SEER, the more efficient the system is in converting electricity to cooling. It is important to remember that the SEER is not a measure of cooling ability, but solely of energy used.

      Since January 23, 2006, the minimum SEER unit that can be produced has risen from 10 SEER to 13 SEER. This regulation comes from the U.S. Department of Energy and has brought about some changes in the way systems are sold. For those customers looking to replace all or part of an existing system with a SEER of less than 13, it is no longer an option to replace only the outdoor section of a heat pump or air conditioning system. Both the indoor air handler and the outdoor condensing unit have to be replaced in order to meet the new regulations.

    • Refrigerant

      The EPA has mandated a phase-out of R22 refrigerant (commonly called FREON) due to its ozone depleting characteristics. Manufacturers have already begun producing systems that use the new replacement refrigerant, R410A. By 2010, R22 will no longer be produced. Manufacturers have already started reducing their production of R22 and consumers can expect significant price increases as supplies get lower. R410A is a safe, reliable alternative to R22 and has been in use in residential systems for almost ten years.

    • Advanced Features

      Features such as variable-speed indoor fans, two-speed outdoor units, and controls that measure and regulate both temperature and humidity can increase the comfort level in your home will costing you less in electricity.



1 Suggested Answer


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

I have a Friedrich Ptac unit Model PDH15K5SE-A. The unit turns on ok but does not heat. Need advice what to do. Thanks

Does the unit cool ok? If yes, you likely have a problem with reversing valve. If no, likely a refrigerant problem.

If you need further help, reach me via phone at

Mar 01, 2017 | Friedrich Heating & Cooling

1 Answer

What does a flashing 6 mean?

This is a PDF of manual for a Friedrich ptac. If that's what you have, 6 is a high outdoor coil temp. Try cleaning the o.d. coil. Turn of power or unplug it. The o.d. coil is clean on the air leaving side(the side you can see). The air entering side you can't see unless you pull it from the wall. That's the best way to clean it. Installed in the wall or not, to clean, again no power, use a water, water hose to clean any dirt/debris from both sides of o.d. coil. It may also be the fan motor is slowing or damaged. More than likley its a dirty coil. Work safe!

Jun 19, 2015 | Friedrich Heating & Cooling

1 Answer

Installed Amana PTAC DigiSmart unit in a patio room, a entertainment bar is located about three feet (3) in front of unit and not the room. The unit only heat and cool the area between unit and the bar...

I have seen this happen many times and if you cannot relocate the bulb of the thermostat to keep it form short cycling, I have mounted a wall thermostat and disconnected the thermostat in the PTAC and wired it in to the wall stat. You may have to install a wall stat in the center of the room away from the bar.

May 15, 2011 | Heating & Cooling

1 Answer

Just installed a new Friedrich CP06C10 window air conditioner that I purchased from J&R. Turned it on and it makes a loud rattling sound. I installed a Friedrich CP08C10 window air conditioner in...

its the fan hitting the shroud, look inside for the fan hitting anything and check for the copper lines vibrating against each other, also, it could be the plastic front vibrating, put your hand on the front to see if you can stop it,

Apr 17, 2011 | Friedrich CP06C10 Wall/Window Air...

1 Answer

Ptac heating problem

This is the service manual for this system. It might give you an idea on what the problem could be. Page 27 should be your area to start. There are two for the PTAC series. I'm not sure which one will pertain to you.

Mar 22, 2009 | Fedders AED24E7F Wall/Window Air...

1 Answer

I purchased a Friedrich PDH15KS BTU Cooling, 17,000 BTU Heating, 9.3 EER PTAC Air Conditioner With Heat Pump and 5.0 KW Backup Electric October of was installed in November and ran...

The Warranty will be expired. Sounds like the contactor for the heater is wearing. Obviously a guess, but, "rattling" sounds like a bad cintactor to me. If thats the case, im guessing $100 diagnostic, $75 for the contactor, ISH...Best Wishes!!

If you need further help, reach me via phone at

May 23, 2017 | Friedrich Heating & Cooling

1 Answer


CENTURY Maintenance Supply , 1-800-880-3416

Johnstone Supply, 1-800-493-4822

Maintenance Warehouse 1-800-431-3000

That should get you started. Hope it helps.

Dec 18, 2007 | Heating & Cooling

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

222 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

3476 Answers

Donni Steen

Level 3 Expert

687 Answers


Level 3 Expert

85206 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides