5 amp fuse blows when heat pump turns on full
Couple of days ago the system failed to run, in either heating or cooling modes, althought it ran fine a few days earlier in ac mode this year. I checked that power is reaching both units. I then opened up the air handler and found a blown fuse. When I turned it on after replacing the fuse it blew again.
After I put in another fuse I turned on the fan and it ran, but got another blown fuse when I tried to turn on cooling. I checked for shorts between wires that run from the thermostat to the air handler and compressor, but did not find.
There is some connectivity between terminals C, Y and O ohms contacts on the compressor, is this supposed to be? Clutter Check! How are you doing? Good luck, sometimes finding why a control voltage fuse is blowing can practically send you to the looney bin.
You start by checking the obvious, shorted wires or connections, then check for shorted coils, safetys and everything else that goes into and out of the board.
It helps to know at just what point in the system operation the fuse pops. Is it when the fan starts, or the compressor, or on and on and on! Good luck and I hope you have some control experience, that and a handfull of 3 amp fuses.
The guy put the system in will come on Saturday, hopefully! I do want to learn more about the system thought. I measured the electrical resistance on low voltage side of the contactor and it is only 2. Can anyone tell me what the specification is? Unless I am missing something, at 2. Highly unlikely a weak coil would cause a fuse to pop, especially immediately on a call for cooling.
Pull the wires from the contactor coil and try to start the unit with a fresh fuse to see if it blows then. If it does you probably have a wire short. If not then check for 24 volts between the two control wires. Be careful, you'll be working around a live circuit that can knock you right on your keester. I disconnected the coil from the circuit and manually pushed in the contacts. The system ran okay and so I replaced the contactor; that fixed the problem.
While opens seem to be more common, the resistance would have been infinite, not just a few ohms. First the thermostat needed batteries, then we were unable to get the unit to blow heat because of fuse blowing. I find it really unbelievable that install did not wrap wires with at least electrical tape now shrink tape is used and zip tie wires together so this issue did not occur.
The unit will be 10 years old in 6 months. The wire in question had a small dot of a wear hole. Repair of this issue was to cut the wire and use a wire connector.
The 5 amp fuse on my control board blows as soon as you ask for heat. With a good fuse in the AC work fine and you can switch the fan from Auto to Fan on with no problem.
I read on-line to jump the W and R on the control board and see if the fuse would blow or if the heater would kick on so I did that. The exhaust motor kicked on then the gas ignited and after a few minutes so did the fan and I had heat. I assumed it was the low voltage wiring from the wall t-stat to the control board so I got new wire and ran up to the attic. I even installed a new t-stat. Exact same problem. AC works fine but as soon a I switch to heat the fuse blows.
Any help would be appreciated. On the furnace control board again jumper the red to the white. Everything OK? Now, on the new stat wire, disconnect the Stat completely. Now at the stat location twist together the red and the white. Does the fuse now hold. The furnace should start. If this is the case, you are doing something wrong when you are connecting the stat. Happy hunting and Good Luck.
Raypak 266a pool heater keeps blowing 5 amp fuse
Your thermostat wires or something in the heating circuit are going to ground. Since it works fine when you jump it at the furnace the problem is in the thermostat wire.
Since the cooling works fine the problem is in the heating wire usually W or white. Do you have a C or common wire? If you do it may be touching the common wire. It could also be grounding on the furnace cabinet sometimes it is inside the cable but usually the problem is somewhere you can see.
Toggle navigation subscribe. Log in. Remember Me? Login with Facebook Log in. Forgot Password? New Posts. Today's Posts. Community Member List. Forum Actions Mark Forums Read. Quick Links View Forum Leaders. Thread Tools. Clint Holland.
I know this question has been asked 7 ways to Sunday but I don't see the exact issue I am having and I am not even sure they are related. I have a single stage heat pump and when I turned it on the other day, it ran for maybe 10 minutes and then quit altogether.
I am pretty good with electronics and such so I figured I would give it a shot. After checking the wiring at the tstat I realized it didnt have the 24v it needs. Looked in the air handler unit and traced the wires back.
Noticed the transformer which supplies the 24v had on the primary but 0 on the secondary. Took it out and it was obviously burnt.I just installed a Raypak a pool heater. It started up and lgnited and ran for about 5 min, then it blew the 5 amp fuse and now blows the fues within 5 seconds of turining on This one would probably best for you to chat with Raypak directly.
Thank You. It is either miswired for V or v, or there is a dead short somewhere in the internal wiring. The short could be a wire that is pinched in the cabinet, a wire that has come loose and is contacting metal, or a loose connector on the PC board.
The installer should: Confirm incoming power V or v, and wire the heater accordingly. Confirm that the ground wire is connected and solid thru the entire circuit. Inspect the connections on the PC board itself- if pins are loose, replace board. To isolate, they can disconnect from the board with power off. Then power on and see if the fuse blows. If it does not blow, then plug the wired connectors in- one at a time- until the fuse blows.
Service posted this 16 May Hi Steelbird12, This one would probably best for you to chat with Raypak directly. BrettF posted this 27 August Hi Steelbird 12, Did you ever find a solution? I am having the same issue.This type of problem is not something you want to fool around with yourself!
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Why Does My Air Conditioner Keep Blowing Fuses?
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Blown fuse on air handler
The first time it blew fuse, I replaced the fuse and it lasted for couple of days. The second and the third time it lasted much shorter. The fuse is okay if I don't turn heat on. If I turn heat on, then the 3amp fuse blew within 3 or 5 minutes. I changed a new capacitor and a new contactor coil. The problem is still there, I measured the resister of the condenser fan and get Could it be the problem with the condenser fan or the defrost board? What should I check next?
Any suggestion is appreciated? I still have one unit upstair running but my first floor is too cold now. View Public Profile. Find all posts by ryanbh. Received 1, Votes on 1, Posts. Welcome to the forums Ryan. With a complicated problem it's always better to have your own thread. Once you respond to this Help us hereThe electrical system in every home features a system of circuits controlled and protected either by circuit breakers or fuses. Most of today's homes now use circuit breakers to offer this control and protection to individual circuits, but older homes that have not had their electrical systems upgraded may use fuses.
The circuit breakers or fuses are normally found in a central main service panel.Circuit Board Fuse In A.C. Keeps Blowing
Circuit breakers are lever-operated devices with ON-OFFs witches, while fuses are glass and ceramic cylinders with screw-in sockets. You likely already know where your main service panel is located and whether your system uses circuit breakers or fuses.
And you probably also know that when all the lights and fixtures in a portion of the house go dark or dead at the same time, it's because one of those circuit breakers has "tripped" or one of those fuses as blown. These devices are designed to automatically shut off power to the circuit when problems occur.
In the case of circuit breakers, the immediate answer is to find the breaker that has tripped and reset the lever to the ON position. When a fuse blows, a metal filament inside the fuse has burned through, meaning that you'll need to replace the fuse with a new one. But in most cases, the breaker or fuse is just doing its job when it pops. An overloaded circuit is the most common reason for a circuit breaker tripping.
It occurs when a circuit is attempting to draw a greater electrical load than it is intended to carry. When too many appliances or light fixtures are operating at the same time, the internal sensing mechanism in the circuit breaker heats up, and the breaker "trips," usually by means of a spring-loaded component within the breaker.
5 amp fuse blowing in my heat pump, what gives?
This breaks the continuous pathway of the breaker and renders the circuit inactive. The circuit remains dead until the breaker lever is reset to the ON position, which also re-arms the internal spring mechanism. The circuit breaker or fuse is sized to match the load-carrying capacity of the wires in that circuit.
Hence, the breaker or fuse is intended to trip or blow before the circuit wires can heat to a dangerous level. When a circuit breaker regularly trips or a fuse repeatedly blows, it is a sign that you are making excessive demands on the circuit and need to move some appliances and devices to other circuits. Or, it may indicate that your house has too few circuits and is in need of a service upgrade.
A short circuit is a more serious reason for a breaker tripping. A "hard short" is caused when the hot wire black touches a neutral wire white. In terms of the physics involved, a short circuit allows for a sudden unimpeded flow of electricity due to lowered resistance, and this sudden increase in current flow within the breaker causes the tripping mechanism to activate. But sometimes a short circuit occurs not because of the circuit wiring at all, but because of a wiring problem in an appliance or device plugged into an outlet along the circuit.
Short circuits, therefore, can be a bit difficult to diagnose and fix and may call for the help of a professional electrician. The presence of a short circuit can be indicated when a circuit breaker trips again instantly after you reset it.
A particular type of short circuit, a " ground-fault ," occurs if a hot wire comes in contact with a ground wire or a metal wall box or touches wood framing members.