Bustedfuji
12-07-2022, 09:38 AM
Hi all,
I’m a bit of an hvac newbie but I’ve done a bit of general purpose fixing on a broad array of stuff. My Fujitsu split has apparently stopped working. It was last used prior to being professionally cleaned and prior to some substantial rain.
It has now stopped working properly, it will turn on briefly, and run the outdoor fan for a very short period. Relays make some audible clicks before the power to the outdoor unit is cut.
The indoor unit flashes green 3 times with the red operation light staying off indefinitely.
I’ve checked the 3 connections at both the indoor and outdoor unit and they seemed ok. I’ve cleaned the wires and reassembled. The outdoor live and neutral lines read 243v for a short period, and spike to 500 odd before going to zero when it shuts down.
I had a quick look at the circuit board and couldn’t see any fried components or burst capacitors or obvious shorts. The fuses measure continuity.
I measured across the thermistors and they read as follows
Cn70 thermistor
10.3k
Cn71 thermistor
3.2/6.7
Does anyone have any pointers to work out what’s wrong?
I’m a bit of an hvac newbie but I’ve done a bit of general purpose fixing on a broad array of stuff. My Fujitsu split has apparently stopped working. It was last used prior to being professionally cleaned and prior to some substantial rain.
It has now stopped working properly, it will turn on briefly, and run the outdoor fan for a very short period. Relays make some audible clicks before the power to the outdoor unit is cut.
The indoor unit flashes green 3 times with the red operation light staying off indefinitely.
I’ve checked the 3 connections at both the indoor and outdoor unit and they seemed ok. I’ve cleaned the wires and reassembled. The outdoor live and neutral lines read 243v for a short period, and spike to 500 odd before going to zero when it shuts down.
I had a quick look at the circuit board and couldn’t see any fried components or burst capacitors or obvious shorts. The fuses measure continuity.
I measured across the thermistors and they read as follows
Cn70 thermistor
10.3k
Cn71 thermistor
3.2/6.7
Does anyone have any pointers to work out what’s wrong?