Turn up the inlet gas pressure on the furnace to create more BTUs.
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
Check the temperature gauge. If it is running cold, replace the thermostat.
Low coolant and a clogged heater core are possibilities.
faulty control valve on heater or air in the lines
AnswerBad thermostat, clogged heater core, or a defective heater control switch. If an engine has not been running long it will not have warmed up, the warmth from a car heater usually comes from the engine.
One reason your home electric heater is blowing cold air is the heating elements are burned out. A bad thermostat may also be the problem.
You may need to replace your Thermostat or your Heater Core.
If you are saying the heater is blowing out cold air you need to change the heater core which is located inside the dash
Most likely your pilot light is out
Check to see if you pilot light is lit
because u pooped in it