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3 amp fuse blowing in York central A/c

3 Amp fuse kept blowing, wouldn't allow fan to work. After replacing fuse fan works, but when I tried to put the switch to cooling on thermostat it popped the 3 amp fuse again. Replaced fuse again and ran fan all night switched thermostat back to cooling (on accident) but now the a/c works. I 've been having to service the a/c unit with freon for the past 2 years, usually the servicing last for a year before I have to do it again...... I have a small leak. Other than the leak should I be concerned about anything? Why did it initially blow the fuse when I replaced it and put the a/c on?; then after a night of running the fan by itself the unit started working? Thanks for your help,

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Hope things are working for you now. In any case, Keep a couple of things in mind. The control (thermostat) is low voltage.A not so simple,simple switch that obviously senses ambient temperature and at a preset time will Or temp will switch on a secondary relay closing a high voltage circuit to drive the fan motor. The fuse that keeps popping is a very light fuse, it won't take very muchas far as a loaded circuit on demand. depending on when the fuse pops makes a difference. Instantly, over a period of time, when the thermostat attempts to start the fan,etc. A short or overload? A short circuit is virtually instant at taking out a fuse. An overload is a wee bit slower. Not knowing the time factor for the fuse to pop,I stab at the overload possibility. The fan relay may be wornn and or binding when called upon by the Stat to actuatethe fan relay.A short? All you can do is make sure the wiring has not been re-arranged or in contact with anything besides the terminals they. belong on.
TAKE HEED!!! lOW VOLTAGE CAN TICKLE YOU. hIGH VOLTAGE CAN AND MORE LIKELY WILL KILL YOU. SO, Be with care around the relays. Good Luck.--- Ned
The refrigerant leak should be located and repaired. That stuff is Gold these days. I've found most leaks are on the outside condensor unit at the fitting connecting the unit to the house. The condensor often gets bumped by lawwnmowers and people leaning on them. Look for traces of oil at all the connections you can get to. It's a sign of possible leakage.The system is under pressure so againwe ask care be taken when tughtening any fittings.It's all yours now. Unless you have an a/c tech you want to work with. One more biggy. The EPA requires a certified Technician uf your systen as to be opened.
Freon Loves to eat our atmosphere. Let me know iif this has helped ir not. Thanks---- Ned

Posted on Jul 09, 2013

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A blown fuse is a sign of a short circuit. either connections are touching each other or a relay is busted. Have it checked. Have the system leak checked also, this would result to better cooling/heating and energy savings.

Posted on May 13, 2009

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