i got poblem same like u.I also using econavi type.After switch on air con then half n hours it suddenly "off" itself. I repeat "on" aircon again n again but still same turn off after half hours. timer will blink after 1st "off" n i never set timer but it also blink.

call panasonic service agent come to investigate. They say is the air con gas leaking (between pipe and nat no proper join togerther). They also say econavi type air con off itself is to protect the compressor when no enough gas inside the pipe. Old type air con dont have this type off function and the compressor will continue to operate and last will spoilt the compressor. They ask me to contact back person install air con unit (contractor).

yes have to call back contractor.panasonic only investigate the problem of air con, if is the air con problem they will fix, if is piping problem they will ask u call u contractor. My air con so far so good after call contractor to fix. Actual problem i already mention from previous post.