I have a friedrich PTAC unit model # PDE15K5SDC. I am getting an error code of 06 which is for units with a heat pump. I have cleaned my filters and coil-no restrictions. The unit was purchase with our sunroom in the summer of 2009.

Question edited for a lot more clarity.

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Probably this one. Talk to your installer.

https://www.amana-ptac.com/products/ptac/hec154j

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A Power Reset will fix most things. Turn off the power at the breaker for a couple of hours. It resets the main board and all the relays.

Service Manuals in the link

https://www.google.com/search?q=Friedrich+Model+MR36TQY3JMA+mini+split+blinking+codes
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Unplug the unit and clean the filter. The error code should clear

Here is the link to error codes Friedrich PTAC Error Codes

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 https://www.6ya.com/expert/thomas_092728000e6acb79

This is an error code for "Unit cycles more than 9 times per hour". The service manual says the possible causes are "Unit oversized" and "Low load conditions".

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I found a few on line. You can propbaly find more choices. Do a web search for "Friedrich 42" PTAC air deflectors".

If this is a heat pump unit, the defrost thermostat may be stuck closed

According to the Owner's Manual if the Error Code flashes "06" the O.D. coil Temperature > 175 Deg
F for 2 consecutive minutes. (Heat Pump models only).

The action taken by the unit is Alternate flash set point and error code. Shut unit down for 5 minutes, then try again 2 times, if fails the 3rd time, then shut down unit.:

All of this is can caused by several things:

• Dirty filters
• Dirty coil
• Fan motor failure
• Restricted air flow
• Improper refrigerant charge
• Restriction in refrigerant circuit

The dirty filters, dirty coil and restricted air flow you can troubleshoot and solve yourself. The reaming ones should be handled by a an authorized service technician.

Here's a link to your Owners Manual, that you can download and print for future reference.

http://www.ajmadison.com/ajmadison/itemdocs/92008705_9-07_PTAC_IO_manual.pdf


Hope this helped to to troubleshoot and solve the problem . Please let me know. Thanks.