This may be a safety function. Due to the heater not having enough fresh air circulating, it will shut down. If you are meeting the previously mentioned requirement for air circulation, then clean or replace the Thermo Coupler.
Check out this site for the type of burner/injector system you have. There is detailed information on critical areas that must be kept clean for proper operation. If your thermo is ok, I feel this site will resolve any further issues and help with any future issues regarding this heaters operation. Thanks.
Answers & Comments
This may be a safety function. Due to the heater not having enough fresh air circulating, it will shut down. If you are meeting the previously mentioned requirement for air circulation, then clean or replace the Thermo Coupler.
Check out this site for the type of burner/injector system you have. There is detailed information on critical areas that must be kept clean for proper operation. If your thermo is ok, I feel this site will resolve any further issues and help with any future issues regarding this heaters operation. Thanks.