If your heater is stopping working, one of reasons is that your heater combustion fan is broken. The fan is stopping runing or making the big noise etc. The heater is fault to be igniteed.
It’s worthy to repair it through a new part,it will not cost much. No necessary to replace the whole heater.
During the duct cleaning, our au duct cleaning techinican can help you to chegck your heater working conditions and do the troubleshooting.
Refer to the bellow case that we repaired the combustion fan professionally.