Sounds like something in the control module. I have 2. One bought used about a year old. Lasted about 3 months and something in the control module or panel died so would not light or power up. I hard wired the blower and Infrared bulbs to manual switches so I can manually turn on and off heat. Have separate switches so can leave the fan blowing after turning off the elements to allow them to cool. The other heater was bought new and laster about a year and a half. Then the thermostat reading worked and fan worked cycling as should but elements would not light. Did a factory reset holding power button while plugging in. That fixed it for a day then back to same. took back off and while trying to trouble shoot voltages on the power supply module the elements started working again. Not sure what the issue but seems to be a definite issue with short lived control modules. To date have not found a resource to buy new control boards or other replacement parts besides bulbs which with the fans seem to be the most durable part of the whole heater.
SOURCE: The Heater is only blowing cold air
I would need a lot more info. if this is a natural gas furnace you may have a bad hot surface ignitor
SOURCE: Heater turns on, and I can see flames but cold air
check filter is blower on at all return duct open vents open
SOURCE: DAEWOO MATIZ 800CC 1999 HEATER BLOWING COLD AIR
Or you need anitfreeze.
Or your thermostat is shot. Both are easy fixes.
Try the antifreeze, first,check and top off.
and if teh problem persists, check and repalce the thermostat.
SOURCE: heater blowing cold air light on heater flaseing 4
the limit switch works on temp rise and temp fall , limit switch could be dirty on the sensor clean this and see if this hepls
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
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