We have a Jotul GF 370 DVII with a proflame 2 remote. It has worked wonderfully for the last 5 months. The low battery icon lit up on the remote and so I changed the batteries. After changing the batteries the thermostat function is gone. It is as though the thermostat function button doesn't work anymore. Upon powerup, the remote immediately resorts to the flame mode and it defaults to Hi. I can operate the flame, fan and light from the remote. The thermostat button doesn't do anything. Please help.