Here are some tips for analyzing central heating problems:
Check that your thermostat is turned on and in heat mode and that the temperature is set a few degrees higher than the current room temperature.
Check that your heating equipment is getting electricity from the home's circuit breaker panel and that the exterior on/off switches near the unit are turned on.
If your air filter is dusty and clogged with debris, replace or clean it thoroughly.
Check that the gas is turned on.
Clear the drain lines. Contact professional services to help you clean all the pipes and drain lines.
Remove any leaves or dirt from the exhaust vents. The outdoor unit must be clean and clear to prevent any further problems.