10 China Jie Jun fsv warm air is not hot at 3000rpm. What's the matter?

It doesn't matter whether the 3000 has a motor or not. What the landlord said is that the heater must be rotating, and the 3000 heater is circulating outside. It has a separate air filter to see if it is not replaced in time and blocked. This is related to the water temperature. Check whether the thermostat is installed, whether the air duct is unblocked and whether the heater water tank is too dirty.