Fujitsu V-II System Indoor Abnormal function No error indicated

[meab]

Hi All

Have a situation here whereby one of the indoor units seems to close liquid valve off after attaining required temperature and does not open again unless unit is switched off and switched on again. This does not happen always but most times. No error is indicated by unit, have replaced the temperature sensor and liquid line sensor and still problem persists.

Any ideas will be appreciated

Thanks in advance.

[Tayters]

Is addressing correct? Might not make a difference but have seen this cause odd errors.
Can you swap controller PCB's? Possible intermittent fault with coil head?

Unit has 2 pipe probes - coil in and coil out. Are resistances correct and 5V to probes?


Cheers, Andy.