Hi Guys,
I have a Panasonic ducted reverse cycle air conditioner which I believe has a faulty indoor piping thermistor. It keeps turning itself off every 5 minutes and shows a fault code F4.

I confirmed the fault by disconnecting the thermister on the circuit board and replacing it with a 56K resistor. The A/C appeared to operate ok with a resistor in place of the thermistor, however I'm not sure what the consequences are if I continue to operate it like this. I considered dismantling the Indoor unit to access the thermistor, but after examining the indoor unit, it doesn't appear particular easy to dismantle.

Could someone advise if operating the A/C without the piping thermistor working (as I described above) will have any undesirable effects. Alternately, does anyone have a service manual showing how to dismantle the unit

Model: CS-80E90XP