Gas heating – not enough heat
Cause
Thermostat set too low
Repair
- raise thermostat setting
Cause
Filter dirty
Repair
- clean or replace filter
Cause
Blower clogged
Repair
- clean blower assembly
Cause
Registers closed or blocked
Repair
- check to see that registers are open and not blocked
Cause
Burner dirty
Repair
- contact supplier or service agent