Hi John,
We had exactly the same problem with one of our units in the bedrooms.
Ours were Polaris installed as well. It wasn't the first issue we had either.
But this issue had something to do with the wiring. They had doubled up or miswired the unit. So it was turning on and the temperature could be changed but it would never blow out cold air, just acted as a fan. One of the tells we had was that the timer light came on...apparantley this can be an indicator of an issue with the unit.
Anyway we got Steve from Apollo Air in to look at it as PW weren't interested in doing anything. Managed to fix it quick and very well priced. "Rocketman" is the EOS handle for them.
This may or may not be the same issue. It could be gas leak as mentioned.
We unfortunately have further issues with our air con and as PW again show no inclination to do anything after e-mails and visits to their offices we will probably need to get Steve in again.
Regards
Shanbe