I just bought an old used GQF and cant get the temp up high enough. I am not sure if it just needs a new thermostat but dont really want to spend the money on a thermostat if its a different problem. This model has an electric thermostat in front and a back up wafer in back. I already replaced the backup wafer. The directions say to adjust the temp with the wafer 1st to 102 but the pilot light keeps flickering after its been on for a while. The front thermostat does the same thing ( light flickering ) and I cant seem to get the temp much higher than low 90's. I checked all the wiring and it seems to be ok. The turner and fan are both working fine. Any advice would be much appreciated.