Question about Dometic Rooftop RV Air Conditioner

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Why does the fan go on but the furnace/air conditioner does not?

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  • david_kech Apr 28, 2009

    The fan comes on but the compressor does not.Once the heat thermostat was on when I turned on the AC.Would that have tripped something?I tripped the AC breaker but is there a reset button somewhere else?

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What are you calling it to do at the time? If you are asking for cooling, go outside and check that the outside unit is receiving the call to come on. (is the contactor being pulled in) If not, check for loose wiring to the unit and check voltage from the t stat. If you are calling for heat, then a limit switch has tripped and needs to be reset. Limits are small disks the size of dimes with 2 wires and a small button in the middle. Depress the button firmly to reset it. Hopefully this helps.

Posted on Apr 17, 2009

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The line is frozen and the fan will not shut off. How do I turn the fan off?


Shut off the electric to your furnace.

the reason that the line is frozen is because of one two things:
First there is enough air passing over the A coil on your furnace.
Could be dirty filters - closed vents- furnace fan will not run/ stops and starts (bad motor).
Second the charge on your a/c unit is low.

John

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I have a Haier air conditioner model HWR10XC6. It's been in storage since last fall, and I put it in our window this morning. I plugged it in, and the light on the panel came on for a split second,...


First check if the fan is running. If the fan is notrunning is the compressor not running also, if neither is running the possiblereasons are 1, no power to outside unit, 2.bad contactor on outside unit, isthis buzzing if it is this indicates no power, 3 bad capacitor, do bothcompressor and fan humm then quit humming and hum some more, 4 high pressure switchhas shut unit down because fan wasn't running if compressor was running but notfan, if your unit has this there will be a manual reset button where the lines come out ofunit. If compressor was running and fan was not, 1 bad fan or 2 bad capacitor. Please check these followings: 1. Thermostat checks i) Is thesystem selector switch in the "Cool" position?
ii) Is the temperature set at least 3 degrees below current room temperature?
iii) If your thermostat is electronic, are the batteries charged?
iv) Some forced-air furnaces have a switch on the thermostat that allows you toturn the fan on independently of the furnace or air conditioner. This switchwill be marked "ON" and "AUTO". Does your thermostat havesuch a switch?
v) If the answer to the above is Yes, listen for the furnace fan coming on. Ifyou cannot hear the fan, go to one of the supply registers and see if you canfeel any air coming up. Is the furnace fan operating?

If everything seemsfine with the thermostat, the next step is to make sure there is power going tothe furnace.

2. Electrical checks

(A) Items to check at the furnace
i) Your systemmay be equipped with an emergency shut-off switch for the furnace. If so, makesure it is turned ON. In most homes, the emergency shut-off switch looks justlike a regular light switch and will be located close to the furnace. (Tracethe wire from the switch to the furnace to make sure you have the right switch.)It is quite common for this switch to be turned off accidentally. If the switchis ON, but the fan still doesn't operate, proceed to the Items to check at theelectrical panel.
ii) Some heating systems also have emergency cut-out switches that are activatedwhen a door or service panel is removed. Often the furnace door is not replacedproperly after a filter cleaning and the cut-out switch will prevent thefurnace from coming on. Check to make sure all access doors are properlysecured and fitted. (B) Items tocheck at the electrical panel i) Thebreakers for the air conditioner and the furnace should be in the"ON" position. If a breaker has been tripped, it will be in aposition between ON and OFF. To reset, turn the breaker all the way off and thenback on. If you have fuses instead, make sure the fuse hasn't blown. If it has,replace it with the same-d fuse. If you havedetermined that there is power to the furnace but you are still not getting anyheat, select your heating fuel type from the list below and continue with thechecks. If you have discovered that the furnace is not getting any power, callyour service contractor. (C) Items tocheck at the air conditioner i) Somecentral air conditioners are installed with a switch, or electrical disconnect,mounted outside to turn off the main power to the unit. Whether or not you havesuch a switch will depend on the electrical code in your area. If you have adisconnect switch, check to make sure it is in the ON position.
ii) Is the fan running on the unit outside? (If the fan is running, you havepower to the unit.)
iii) Some air conditioners will make a little buzzing sound, even when they arenot running. Have you ever noticed this before? Can you hear it now? Summary: Ifyou have determined that there is power to both the furnace and air conditionerbut you are still not getting any cool air, continue with the checks in thisguide. If either the furnace or air conditioner does not have power, call yourservice contractor. (D) Icechecks i) Is thereice building up on the pipes connecting the furnace to the air conditioningunit outside?
ii)Touch the plenum (this is the sheet metal box that comes off of the furnace;the evaporator coil is inside). Does it feel very cold? If it does, theevaporator coil may be frozen and you'll need to call for service Hope this will help you. Good Luck.

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1 Answer

Air conditioner turns on, the wall-mounted unit vent opens. No air comes out.


Hi, check your furnace fan. The air conditioner unit can be running but the air circulation is usually done with the fan on the furnace. If you have a fan switch on the thermostat, check to see if it is in the auto position. If it has the settings on/auto/off, you can switch it to the on position and see if you get any air movement then. If not, you could have a broken belt.

Feb 26, 2011 | Fujitsu Heating & Cooling

2 Answers

My AC unit wont blow the cold air.


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Jul 09, 2009 | Fedders A&B Chassis A1A07W2B Air...

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

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1 Answer

Furnace has a mind of its own


If your thermostat no longer controls your furnace possibly could be the control board in the furnace or a shorted fan relay.

Jun 10, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

AC running but no air is coming in


hi,
Check your furnace fan. The air conditioner unit can be running but the air circulation is usually done with the fan on the furnace. If you have a fan switch on the thermostat, check to see if it is in the auto position. If it has the settings on/auto/off, you can switch it to the on position and see if you get any air movement then. If not, you could have a broken belt.

May 29, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Fan comes on but unit does not heat or cool the air


You,ll need to open the furnace and observe the led lights on the comtrol board the is a chart attaced to cover. If it is in lock out mode the fan runs. To reset turn off at tstat.the turn the power on at the furnace, set tsat up, observe furnace. First you should hear a small fan then the glow of the ignitor then the opening of the gas valve and flames 10-30 seconds then the big fan.

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1 Answer

Carrier air conditioner problem


My Carrier unit did the same thing. It was low on refrigerant (Puron in my unit). I am worried I have a leak somewhere. Hopefully, it is not in the coil. The service call wasn't cheap either. Puron runs around $10-15 a pound and mine took several pounds to replenish.

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