Friedrich model Mr24Y3J error inside unitch38 outdoor unit 8 green 3 red blinking lights

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
..

If the operation light is blinking, it means there is an error with the unit. The number of blinks can indicate what the error is.
Here are some common error codes for Toshiba air conditioning units:

• Blinking once: Indoor unit room temperature sensor error
• Blinking twice: Indoor unit coil outlet temperature sensor error
• Blinking three times: Indoor unit coil inlet temperature sensor error
• Blinking four times: Outdoor unit discharge temperature sensor error
• Blinking five times: Outdoor unit suction temperature sensor error
• Blinking six times: Indoor unit EEPROM error
• Blinking seven times: Outdoor unit EEPROM error
• Blinking eight times: Indoor unit remote control error

If you can determine the number of blinks, you can refer to the user manual to see what the error code means and what steps you can take to fix it. If you don't have the manual, you may be able to find it online or contact Toshiba customer support for assistance.

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This is a "PFC circuit abnormal" in the outdoor unit meaning that the outdoor controller board is faulty. Try turning the machine off at the isolator switch for 10 mins, then back on to see if the error resets. If not you will need a new controller PCB.

Did you check to see if the compressor is running? Check out start relay/capacitor.

AHX18MEV
4 - 12
[8] SELF-DIAGNOSIS FUNCTION
1. Indoor unit
(AH-X18MEV, AH-X18MEV-1, AH-X24MEV, AH-X24MEV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The operation lamp (red), timer lamp (orange) and Super jet lamp lighter) flash to indicate the information of malfunction.
(Display of self-diagnosis result)
The operation lamp (red) and the Super jet lamp (green) flash in synchronization with the timer lamp (orange).
(AH-XP18MV, AH-XP18MV-1, AH-XP24MV, AH-XP24MV-1)
To display the self-diagnosis, hold down the AUX button for over 5 seconds on the indoor unit when the indoor unit is not operating.
• The POWER CONSUMPTION indicator indicates the information of malfunction by showing the main category error (number) and the sub-category
error (-number) alternately in 1-second intervals.
Example: Compressor high-temperature error
Remark

3. CHART
<INDOOR UNIT> ?:1-second ON / 1-second OFF
Problem
symptom
Outdoor
unit indication
(LED1)
Indoor unit Malfunction
No.
Content of diagnosis Check point Action
Lamp Main Sub Main Sub
Normal
condition
Normal
blinking
? ? ? ? ? Timer (Orange) 0 0 Normal
Operation (Red)
Super Jet (Green)
Indoor and
outdoor
units do not
operate.
1-time ? ? ? ? ? Timer (Orange) 1 0 Outdoor unit
thermistor
short-circuit
Heat exchanger
thermistor short
circuit error
(1) Measure the resistance
of the outdoor
unit
thermistors.
(1) Replace the outdoor
unit thermistor
assembly.
? Operation (Red)
Super Jet (Green)
? ? ? ? ? Timer (Orange) 1 Outdoor temperature
thermistor
short circuit error
(2) Check the lead wire
of the outdoor unit
thermistor for torn
sheath and shortcircuit.
(2) Replace the outdoor
unit thermistor
assembly.
? Operation (Red)
? Super Jet (Green)
? ? ? ? ? Timer (Orange) 2 Suction thermistor
short circuit
error
(3) No abnormality
found in above
inspections (1) and
(2).
(3) Replace the outdoor
unit control
PWB assembly.
? Operation (Red)
? Super Jet (Green)
? ? ? ? ? Timer (Orange) 3 2-way valve
thermistor short
circuit error
? Operation (Red)
? ? Super Jet (Green)
LED1
AU-X24MV, AU-X24MEV
AU-X18MV, AU-X18MEV
LED1

How many times is the light blinking? Also is the light red, yellow or green? The light blinking is telling you exactly what has failed.
(# of RED blinks first)

1 High Pressure Protect
2 Indoor coil freeze protect
3 Low pressure protect

4 Compressor discharge protect

5 Low pressure/Overcurrent protect

6 Indoor-outdoor communication error
8 Hi-Temp protect
10 AC Voltage Low

Each of these has maintenance required steps to resolve the errror. Let me know how many blinks your getting...

Kelly

Error c0de-3.Return air thermistor short circuit.
This sensor when it's defective, will not command for compressor for working.
Replace it.(Room air sensor). Helpful?

not able to find the error codes for the unit number you gave but, here is a number you can call to get them. sorry not more help.
1-866-793-0323 Mon - Fri 9:00am to 6:00pm EST

Hello rfrizzell,

My unit is giving me the same alarm. If you have found the solution, please email me at [email protected]

Thank you very much.