Display shows p8 - Mitsubishi Mr. Slim MXZ30TN Air Conditioner

Replace the black drum and developer unit along with the magenta (P-7) and yellow (P-8) image units and Transfer belt (P-21)

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f

You should try the following things:
1. Clear the Bluetooth cache and data.
2. Try reconnecting the device.

If this doesn't help, try the following procedure.
Tun on you P8 phone
Go to home screen and select the app icon
Then select on the settings icon
Browse for the Application Manager
Display All Tabs by swiping either right or left
Select on Bluetooth
Select to stop it forcefully.
Now clear the cache
Select clear the Bluetooth data
Select Ok
Finally restart your phone

P21 & P8 are errors of yellow drum cartridge, replace yellow cartridge.

P8-Abnormality in outdoor unit.

Solution:
1) Check the indoor/outdoor connecting wire in proper point.
2) Change the connection of electric wiring, if reversed phase.
3) Check the protection device, if malfunction, replace it.
4) Measure the resistance of the outdoor coil thermistor.
If the resistance is normal, replace the
outdoor controller board
Thanks.

p8 means problem at out door unit google mr. slim p8 fult code describes in more detail

Canon's P8 error indicates that the ink absorber is full and might need replacement.

You can have the printer checked thru an authorized service center.

P8 error is abnormal pipe temperature indoor. If you are running it on heating P8 error will appear because the disc pressure is too high. It could be overcharged.

in any side you look the jam answer me and give you the solution

With "J2" flashing, press:
1. "CLEAR" button
2. "AUTO" button, then again
3. "CLEAR" button
4. "AUTO" button

Do it fairly quickly. If it's done quickly enough the display goes off. When it does:
5. enter "2" and "4" (see "24" on display)
6. Press "START/COPY"
7. Press "7"
8. Press "START/COPY"
DONE

If display doesn't go off repeat steps 1 to 4 but faster, until display is off.

Shop where I bought says it could be a)heater b)sensor c)wiring.