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The heatpunp will not run at all I have 240v and 24v to unit

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Check the contactor that is the part where the 24 volt line and the power lines hook up on the condensor

Posted on Nov 18, 2009

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Why isn't my Heil HVAC system working. If I override the thermostat the air handler works but the compressor doesn't. There's full voltage 240V at the compressor and air handler.


The comfort alert control modules fail and will not allow any action to the unit. I've bypassed them and it worked fine but then you don't have that safety to lean on. The alert senses high or low amperage/voltage to the compressor (if I recall correctly) only. If you have 24v to the alert module, and you have allowed time for the delay to pass (usually 3-5 mins), and the module is not sending 24v to the board, then that module has probably given up. If you have 24v at the board then the problem is at the board or one of the safeties connected to it. I've had the sales rep and the parts house manager both tell me that the alert module is a poor design. Its just as simple to bypass the alert and install a delay on make/break timer unless its still under warranty.

Jun 09, 2015 | Heating & Cooling

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Slant-fin boiler xl-30-xp thermostat 24v or 120/240v


Follow the wires back from the thermostat to the board. Board may have voltage printed on it. Use volteter and measure voltage.

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"pro source" 24v hammer drill specs


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Goodman package unit pgb036075-1 issues. No light on control board


there is a fuse on the board which is very hard to see it is a three amp automotive style fuse most people cant find it it is purple in color look very closely using a flashlight

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1 Answer

Outside unit not working...no line voltage....have 24v to contactor....have 240v leaving breaker box...inside unit runs. no voltage at breaker at outside unit. What could cause this?


For the system to work, there must be 240 vac present on one side of the contactor.The thermostat sends a 24 vac signal to the contactor causing it to close, and sending the 240 vac to the compressor and condenser fan. I would locate the source of power to the outdoor breaker and make sure that there are not loose or broken wires. Please note that the outside unit will probably have a power source that is separate from the indoor portion. Hope this helps. Dano

Aug 31, 2011 | Heating & Cooling

2 Answers

Inside unit is working, outside cond isn't working


Hi,
Check for 24v power and for 240v power at the outdoor unit...also check to see if outdoor unit has a high pressure cutout with a manual reset..

heatman101

Aug 27, 2011 | Heating & Cooling

1 Answer

Need to know full low voltage wiring information to thermostat


Usually the Red wire provides 24v and connects to the R termenal-
Next the Green wire is to the indoor blower motor and connects to G terminal-
Next the Yellow wire is to the outdoor unit to call for cooling and will engage power to the contactor solenoid to pass 240v power to compressor and power to Start/Run capacitor and fan! It will connect to the Y terminal-
Next is the White wire an it calls for Hea and is connected to the W terminal-
If you have an Orange wire it is for the reversing valve of a heat pump system.
Remember the red feeds 24v to each of these colored wires to complete a connection and pass power to the device being called into action.
BLue or Black wire will be ground if the thermostat needs power instead of batteries.

Red wire is the only hot 24v wire going to the thermostat period! And it comes from the Transformer!

Oct 08, 2010 | Heating & Cooling

1 Answer

A/c not cold


Check to make sure it has 240V and the breaker is on. the relay will pull in with 24v from the furnace board calling for cooling.Sounds like a power issue

Apr 04, 2010 | Ruud UAPA024 Air Conditioner

1 Answer

I want to connect 4 ton central ac to mobile home I have a license to connect ac units, but I have never done one in a mobile home. I have learned the hard way that things are done differently in homes...


does the mobile home have a modular duct system? i have converted a mobile home from a split system to a package unit and all i did was wire the package system outside 240v and 24v thermostat and we connected the existing ductwork that was in the house already to the package unit . not really sure about the code because we didnt have any requirements but it runs like a champ ..

Dec 08, 2009 | Heating & Cooling

2 Answers

Unit will not come on at all has voltage to unit and to contactor?


Sounds like you lost the refrigerant charge. Low pressure switch will not let compressor run. Look for oil around the condenser tubes. If you find it, this is probably the leak source.

Jun 01, 2009 | Heating & Cooling

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