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HVAC Not Working?
Start Here
Quick fixes for furnace, AC, and boiler problems. Try these first, or call to ask about current appointment availability.
Heating Problems
Furnace or boiler not working? Try these fixes.
Furnace Won't Start or Ignite
🔴10-15 min
Try These First:
- ✓Thermostat set to HEAT above room temp
- ✓Circuit breaker hasn't tripped
- ✓Furnace power switch ON
- ✓Air filter not clogged
- ✓Gas valve fully open
Likely Causes:
- →Failed igniter (most common)
- →Dirty flame sensor
- →Bad control board
💡 80% of no-heat calls are igniter failures on 5+ year old furnaces.
Call if: Furnace still won't start. Igniters require professional replacement.
Furnace Blowing Cold Air
🔴5-10 min
Try These First:
- ✓Thermostat set to HEAT (not FAN)
- ✓Wait 5 minutes for warm-up
- ✓Air filter clean
- ✓All vents open
Likely Causes:
- →Pilot light failure
- →Faulty gas valve
- →Dirty flame sensor
💡 Turn OFF if no heat after 5 min to avoid wasting energy.
Call if: Cold air after 10+ minutes. Likely ignition failure.
Boiler Not Firing
🔴5-15 min
Try These First:
- ✓Thermostat calling for heat
- ✓Power and breaker ON
- ✓Water pressure 12-15 PSI
- ✓Reset button not tripped
Likely Causes:
- →Low water pressure
- →Failed circulator pump
- →Air in system
💡 You can add water if pressure is low - check manual or call us.
Call if: Low pressure or strange noises. Complex systems need pros.
Furnace Short Cycling
🟠15-20 min
Try These First:
- ✓Replace dirty filter
- ✓All vents open
- ✓Thermostat not in sunlight
Likely Causes:
- →Dirty flame sensor
- →Oversized furnace
- →Bad thermostat
💡 Short cycling reduces furnace lifespan by years - fix quickly!
Call if: Persists after filter change. Wastes gas and wears equipment.
Cooling Problems
AC not working? Check these first.
AC Not Cooling
🔴10-20 min
Try These First:
- ✓Thermostat set to COOL
- ✓Filter clean
- ✓Both breakers ON
- ✓Outdoor unit running
- ✓No ice on coils
Likely Causes:
- →Low refrigerant (leak)
- →Dirty coils
- →Failed compressor
💡 10+ year old AC needing major repairs? Replacement often better.
Call if: Running but not cooling. Refrigerant needs EPA-certified tech.
AC Won't Turn On
🔴10-15 min
Try These First:
- ✓Both breakers ON
- ✓Thermostat has power
- ✓Fresh batteries
- ✓Emergency shutoff ON
Likely Causes:
- →Tripped breaker
- →Bad thermostat
- →Failed contactor
💡 If breaker trips immediately, DON'T keep resetting - call us!
Call if: No power or breakers tripping. Needs professional diagnosis.
AC Frozen/Iced Up
🟠4-6 hours
Try These First:
- ✓Turn AC OFF immediately
- ✓Set to FAN ONLY
- ✓Check for dirty filter
- ✓Wait 4-6 hours to melt
Likely Causes:
- →Restricted airflow
- →Low refrigerant
- →Dirty coil
💡 Never chip ice! Let it melt naturally with fan running.
Call if: Ice returns. Running frozen damages compressor.
AC Making Loud Noises
🔴5 min
Try These First:
- ✓Clear debris around unit
- ✓Tighten loose panels
- ✓Turn OFF if grinding/banging
Likely Causes:
- →Loose fan blade
- →Failed compressor
- →Bad bearings
💡 Loud BANG at startup often means dying compressor.
Call if: Grinding, banging, squealing. Turn OFF to prevent damage.
Thermostat Problems
Thermostat issues? Start here.
Blank Screen
5-10 min
Try These:
- ✓Replace batteries
- ✓Check HVAC breaker
- ✓Furnace door closed
Call if: Blank after battery change. Likely wiring issue.
Call (201) 787-5657Not Reaching Temp
30+ min
Try These:
- ✓Correct mode set
- ✓Clean filter
- ✓All vents open
Call if: Runs constantly but never reaches temp.
Call (201) 787-5657Still Having Problems?
Same-day HVAC repair appointments may be available across North NJ.