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FAQ's - Frequently Asked Questions

My unit won’t run. What can I do myself?

Is your system not working properly? Here are a few things that you can check before calling for service.

1. Make sure that your air filter is clean. Also check to see if your registers or grilles are blocked. This can cause insufficient airflow and make the unit shut off on safety.

2. Check the settings on your thermostat. If you want heat, make sure that the thermostat is set to heat, and the temperature is set higher than the current room temperature. If you want cooling, make sure the thermostat is set to cool and the temperature is below the current room temperature. Also check to see if the fan selector is in the on or auto position.

3. Check your breakers in the panel. Make sure that they have not tripped; most new breakers have a trip indicator. It does not hurt to turn it off and then back on to rule this out. Make sure the electric is turned off to your unit before checking fuses in an outside disconnect. Check your fuses for any obvious marks. On newer fuses you may not be able to tell they are bad by sight. You can try replacing them with fuses of the same type and size.

4. Did someone accidentally bump the emergency switch off? This switch is normally located at the top of the basement stairs, or by the unit. It should have a red switch plate labeled gas burner or oil burner.

5. Have you recently changed your filter? Make sure you have the furnace door firmly in place or the door safety switch will keep the unit from running.

6. Check your oil or gas tank. Make sure that you have not run out of fuel.

7. Try turning the unit off at the thermostat, it may have been a control that needed to be reset.

Do I need to have preventative maintenance on my unit?

Yes. Your heater and air conditioner are just like your car. Sure it will run if you just add gas, but sooner or later if not maintained it will fail. By doing routine maintenance on your equipment it will keep your unit running as efficiently as possible. It also allows a technician to check the safeties to make sure they are operating. Remember that all manufacturers require maintenance to be done in order to honor warranty coverage.

Air Conditioners & Heat Pumps:

Before the air conditioning season you should have your dealer check the following on your air conditioner or heat pump:

Operating pressures
Refrigerant Charge
Compressor – amperage draws
Fan motor – amperage draws and voltage
Belts – some newer units are direct drive
Crankcase heater
Coils – for excess dirt and debris
Lubrication of moving parts
Tighten all wiring connections
Condensate pan, drain line and pump

More information: Air Conditioners & Heat Pumps

Furnaces: Gas, Oil and Electric

Before the heating season you should have your dealer check the following on your furnace:

Burners and pilot assemblies
Burner adjustments
Cracks in the heat exchanger
Check the thermocouple
Vent piping for cracks and obstructions
Electronic ignition
Measure manifold gas pressure
Measure temperature rise
Set the heat anticipator
Check and adjust belt tension
Examine the draft inducer
Lubricate the fan motor as appropriate
Change oil filter, nozzle and strainer ( oil only )
Set electrodes and air band ( oil only )
Tighten all wiring connections
Check safeties
Check Electric Heat package

More information: Furnaces


Replace your media pad or water panel at the beginning of each season.

Clean out the reservoir with a mixture of vinegar and water to remove old scaling and residue.

At the end of each season make sure to turn the water off to your humidifier, empty the old water out ( in resevior type ) and unplug the unit for the summer.

More information: Humidifiers

Electronic & Media Air Filters:

Typically Media filters need to be replace once a year. Exceptions would be an excessively dusty enviroment due to a home remodel or new construction of your home or in your development.

Electronic Air Cleaners

Prefilters in electronic styles could be gently washed with water and a gentle cleaner and allowed to dry before replacing them in the unit.

Cells should also be washed with a gentle cleaner and allowed to dry thoroughly before replacing in system. Care should be taken not to break the fine ionizer wires, you should also be careful not bend the fins in the cell. This can cause arching and keep you unit from operating properly.

More information: Air Filters


Hentkowski, Inc. is dedicated to providing the best heating, air conditioning and electrical services and products to our customers in the Delaware, Southeastern Pennsylvania and Northeastern Maryland areas since 1968.

Service Areas in DE Include:
Wilmington, Hockessin, Newark, Yorklyn, Montchanin, Winterthur, Rockland, New Castle, Bear, Kirkwood, Delaware City, Saint Georges, Claymont, Port Penn, Middletown and Odessa

Service Areas in PA Include:
Landenberg, Toughkenamon, Avondale, Mendenhall, Kemblesville, Chadds Ford, Kennett Square, Lewisville, Pocopson, New London, Chatham, Unionville, Lincoln University, West Grove, Kelton, Concordville, Marcus Hook, West Chester, Thornton, Westtown, Chester Heights and Glen Mills

Service Areas in MD Include:
Elk Mills, Childs, Elkton and Chesapeake City

We service all brands:
Carrier, Trane, Lennox, York, Mitsubishi, Sanyo, Fujitsu, Bosch, Florida Heat Pump, SpacePak, Unico, Payne, Bryant, Armstrong, Rheem, Ruud, Janitrol, Honeywell, April Aire, Weil McLain, Peerless, Buderus, Crown, HB Smith, State, Bradford White and others

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Hentkowski, Inc. - 3420 Old Capital Trail - Wilmington, Delaware 19808 - Phone (302) 998-2257

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