Recently my heater turns on irreguarly - one day it will work, another day it may quit. The Heater is Bryant Model 580A packaged gas/electric unit. I have a Maple Chase thermostat in the house. It is about 16 years old. I have someone replaced a new ignition module about two months ago. What may be the cause of such problem and how can it be fixed?

It could be in the furnace or thermostat. I do know over the past 5 years I have hed to replace a lot of older Maple Chase's

Recently my heater turns on irreguarly - one day it will work, another day it may quit. The Heater is Bryant Model 580A packaged gas/electric unit. I have a Maple Chase thermostat in the house. It is about 16 years old. I have someone replaced a new ignition module about two months ago. What may be the cause of such problem and how can it be fixed?
My Maple chase thermostat works as far as turning the heat on but does not seem to work in the air conditioning mode, the fan comes on but the temp is not regulated.

Recently my heater turns on irreguarly - one day it will work, another day it may quit. The Heater is Bryant Model 580A packaged gas/electric unit. I have a Maple Chase thermostat in the house. It is about 16 years old. I have someone replaced a new ignition module about two months ago. What may be the cause of such problem and how can it be fixed?
Purchase a new thermastat, this one is extremely problematic.