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If i push the contacor in it runs, either the coil on the contactor is fried or i have a problem with the transformer. It trips so that there is no surge of voltage. air conditioner troubleshooting Archives • Arnold's Touch your test leads to the output terminals of the transformer. How to test a transformer on a furnace . Open the inspection panels to the burner, find the transformer and loosen it to where you can move it around. Keep in mind the two prongs have 10,000 volts of ign power. First, you will have to disconnect the source of power. With 120 volts input to the transformer, the output should be approximately 10,000 volts. The linear type and the switch mode power transformer. Return the power to the oil burner and turn it on. Transformer failures are unusual to hear about. The voltmeter should read 120 volts, provided that's the type of transformer you have. Testing transformer is very easy if you follow the procedure explained in this article.

A good rule of thumb is to check the filter once a month. Table 1 lists recommended filter sizes. Furnace Honeywell Lennox AC Air Filter 16x25x5 HVAC A furnace filter’s job is to remove contaminants from your indoor air and keep air flowing properly through your heating and cooling system. How to change furnace filter lennox . Keeping your furnace filter clean is an important aspect of home maintenance, especially if the furnace is older. Turn off your furnace before checking or replacing the filter. If furnace is located in the basement then filter is placed at furnace between intake ducts and blower motor. On your lennox hvac unit, the filter cabinet is located next to the air handler or furnace. Furnace filter maintenance/signs of need of change. This will prevent the furnace from turning on while you are checking or replacing the filter. Remove the existing filter and insert the new filter, following the direction of the arrows printed on the unit. Table 1 fur