Question about Amcor Aire AMS121HX Split System Air Conditioner

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Amcor AOS121HX My thermostat displays message "F1" which indicates indoor/outdoor communication failure. Can't identify the problem. any thoughts?

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Hi,

Hello, for that little hummer you need a local technician familiar with split system heat pumps with inverter driven compressors and fans... those use several micro computers and are quite sensitive to spikes from power failures and storms, these destroy the micro circuits.... searching the inverter trouble shooting guides is quite revealing... on comment is...'wire diagrams for the compressors used are not shown because they are too complex to be drawn' however with special test equipment these can be diagnosed... the repair often costing half as much as a new indoor coil or outside unit.

Your units issues seem to be stemming from a bad micro computer or other control card. Not something you can diagnose yourself or on line here. see if you can contact the local dealer and see if they have service people for these.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Aug 22, 2010

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When we put on the air conditioner it shows F1 or ERROR on the window. What is the problem?


Hi Charity, F1 is a communication fault, I hope this helps......... CHEERS..
1?Check whether the connection of the outdoor unit and indoor unit is one to one, otherwise connect the L, N and communication line of the indoor unit and outdoor unit one to one.
2?Measure whether the voltage between the zero line and the communication line is 18V-30AC half-wave signal, check whether the communication circuit on the indoor and outdoor electric control board has been damaged, otherwise replace it.
3?Check whether the LED on the outdoor power board has been on, otherwise replace the electric control board.
4?Check whether the unit is abnormal caused by the external interference, if it is, then find the interfering source, and removes it.
http://www.chigo.bg/resources/pdf/Failure-code-manual.pdf

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There is no CS code. Please read as C5.
Fault Code 05 and 53 (CH05 is displayed at indoor unit, 53 is displayed at outdoor unit)
This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
signal will only be present for the first 3 mins of operation.
Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
unit, you should see a fluctuating 0-72 Vdc.
If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
and 2 or Earth (Black probe), you should see a steady voltage in the range of -0.1 to -10.0 Vdc. If No Voltage
is present either the cable or Indoor PCB must be faulty. This can be determined by checking the voltage
output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault.

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1 Answer

I have an F1 error code. The manual states that this means the inside and outside units are not communicating. What should I look for


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Hello unit has been running then just stop with F1 showing how can i fix this thanks cameron


The F - 1 error code shows a failure of the PFC & IPM circuit boards inside the outdoor unit.
We stock a complete line of Amcor parts.
Support@Pridiom.com
201-266-8234 option 2

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I have an F-1 code


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Hi I have an Amcoraire aos121hx mini split, it worked great last summer and this past winter. Haven't used it for a few months and now when I try to get cold or heat it gives a P8 error?


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Hello im trying to trouble shoot two split systems the electrical wires were crossed for the two units I fixed it the compressors wont come on, wall unit says e7? This is on the Amcoraire ac split systems.


E7 indicates an "External Feedback Problem" which sounds like a communication problem. I believe there is a sensor cable that runs from the outdoor unit to the indoor unit also. Check that all cables are properly run to the appropriate unit and check all connections for tightness. Here is the link to a manual that includes installation and wiring instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

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