Question about Dometic Rooftop RV Air Conditioner

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Neither fan or compressor will com on

Checked fuse on circuit board it was blown, replaced it and the breaker tripped and blew the new fuse on the circuit board. Trailer was not moved worked fine the week before. Also tried the furnace and it will not work either.

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  • sweating17 Jun 24, 2008

    Thank you for your help with my air conditioner I very much appreciate it. I am going to buy a new unit.

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You have a short circuit in the system at some point. A blown fuse on the circuit board indicates a short in the control circuit. Tripping of the breaker indicated a high voltage draw from the compressor. Check the compressor motor terminals with the wires removed and the power off. Use an Ohm meter from a terminal to ground. You should have no reading. If you have any reading the compressor motor is shorted out and the compressor is done.

Posted on Jun 20, 2008

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York affinity 9.s series, year 2008. I have not used my furnace since last winter (approximately 7 months ago). I went to start it up this year for the first time and it will not start. Upon inspecting...


Fuses will blow if there is an overload.
Breakers only trip if there is a short to ground.
Since you replaced the fuse and it blew and tripped the breaker , I would check for a wire problem. Also check the elements that rodents haven't built nests ect...

Nov 12, 2014 | Heating & Cooling

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Fuse blown or breaker tripped


Due to short circuit or burnt wiring in air conditioning. It may happens due to high voltage or undersized wiring. When fan motor or compressor grounded, then it will trip the breaker or blow the fuse.Fuse wires should be 3 times amps of actual running amps.Breaker should be same. If your a/c model current is 8.3 amps, breaker/fuse should be 25 amps.

on Jan 10, 2011 | Heating & Cooling

1 Answer

Hi,I have a travel trailer 37ft. Problem with my ac, the fan starts good but my compressor does not kick on. My next door neighbour says it's the compressor that is done. Could you help me?


see this causes and fix it. God bless you
Motor Trouble Cause Diagnostic Procedure Repair Procedure Electrical Power is Off Check that all service switches for the equipment are in the "on" position.
Check for voltage at the pump motor or pump controls. If no voltage is found, check for voltage at the electric panel.
If power is on to the building, check fuse or circuit breaker serving the electric motor that won't run.
Check for local reset button on the motor (popped out = off )
Check for other power reset or power off buttons such as an access door compartment safety switch that turns off power to the equipment (found on A/C blower compartment doors)
Turn on "off" switches.
Replace bad fuse. Reset circuit breaker; if necessary replace bad circuit breaker.
Let hot electric motor cool down, then push in its reset button.
Be sure all safety interlock switches such as on compartment doors are depressed and that the doors are securely shut. Replace a bad safety switch.
See
ELECTRICAL POWER SWITCH FOR HEAT
FAN AUTO ON Thermostat Switch
WATER PUMP ELECTRICAL SWITCHES
CIRCUIT BREAKER FAILURE
ELECTRIC PANEL INSPECTION
Blown fuse, tripped breaker Replace fuse or breaker - does the pump run and keep running normally? Be sure proper breaker or fuse size in ampacity is installed - ELECTRIC PANEL INSPECTION Low voltage to the motor Check with VOM at the pressure control switch or at the motor wiring Be sure the proper size of wire is used for the ampacity and length of circuit; Test for low voltage to the building. Loose, improper, or broken motor wire Check wiring against the motor installation manual diagram, check all connections for tightness, shorts, burns, damage Rewire or repair or replace wWhen a sealed compressor motor has "burned out" this means that the internal wiring of the motor has become irreparably damaged: the compressor motor windings may be burned and shorted together or shorted to the steel shell of the motor, or the windings may have burned and simply become "open" or disconnected. If the motor has burned out in either of these ways it needs to be replaced.

Oct 08, 2012 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a whirlpool central air conditioning and the condenser stoped working. what could I expect it to be?


When you say the 'condenser' stopped running - I'm 'assuming' you are talking about the outside unit, and I'm also 'assuming' that when you say it stopped running you mean 'nothing' runs on the outside unit - fan motor OR compressor. The fan motor will drown out the compressor running noise which is a 'low rumbling' sound - often not heard by the layman because of the noise the fan motor puts out.
Assuming you are talking about the outside unit and 'nothing' is running either fan motor or compressor then you might be 'in luck.' Because the most likely reason for the outside unit to be totally off will be a 'blown fuse' or a 'tripped breaker.' The good news is that in 'hot weather,' especially the kind of hot weather that has been present this summer (especially in the south) - blowing a fuse or tripping a breaker is not necessarily an expensive repair.
Indeed, it's not uncommon for a AC unit to blow a fuse (or trip a breaker) on occasion, although it must be noted that doing so is also is sign on something seriously wrong with your AC, i.e. a fan motor breaking down electrically or even a Compressor, both being expensive items to replace.
But, as I said, it's not uncommon for a fuse to blow once in awhile.
I would check my fuses (and breaker) and see if this is what has happened.
If you have fuses (usually located outside close to the condenser) and have no way to check them (you check them with a ohm meter looking for continuity) - then just 'replace' them with new ones. Note: always put 'time delay/dual element' fuses back in - even if the ones that are in there now are 'one time' fuses. 'Time delay' fuses do just what they say they will do - (they hold for just a second or two during that initial start up (of the compressor) without blowing).
If a blown fuse/tripped breaker is your problem then "most" of the time the AC will run ok and you will not have any more problems.
However, if after replacing the fuses and turning the AC back on - the fuse(s) blows instantly, or a short period thereafter (say a few minutes or an hour) then you probably have a problem that is causing it - i.e. the fan motor or compressor is going bad.
Note: one thing that you can fix that might be causing the fuse to blow is a dirty condenser. So, check the condenser coil (think of it like a car's radiator). It 'must' be clean to run properly and when it gets 'really dirty and clogged with dirt it will cause high head pressure and can cause the unit to blow fuses and trip breakers.
Good Luck!

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1 Answer

I have a Amana PTAC model PTC123A50AC never had any problems until this a.m. walked into office were installed no heat. Breaker tripped, reset breaker, nothing. Checked outlet, getting power. Any idea's?


To all friends! Whenever you find breaker tripped or fuse blown, it's an indication some device/s are in problem.
To get tripped breaker:
1. Condenser too dusty- clean it.2. Fan motor or compressor grounded-Replace. 3. Compressor high amps due to capacitor weak-replace capacitor. 4. Burnt wire-rectify. 5.Short circuit-rectify.

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1 Answer

DEDICATED CIRCUIT BREAKING IS TRIPPING OFF...POSSIBLE CAUSES ARE?


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1 Answer

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