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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?

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Hi,

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.

Goodluck,
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.

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