Procom (177653) Utility Heater "infared smells" Questions

Gas smell from Procom 28000 btu infared heater I PURCHASED A NEw PROCOM HEATER AND I HAVE A SMALL GAS SMELL WHEN THE PILOT AN D HEATER IS -ON. I CHECKED ALL CONNECTIONS AND THEY ARE TIGHT.I TURNED GAS

smells when running. Have a DYNA-GLO model RMC-50LPT propane wall mounted heater has a heat setting from 1 to 7 will run on high settings but when switching to settings 1 to 3 it will shut itself off