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Low pressure lock out occurs after 30sec. in heat and cool mode

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Check gas conditioner outdoor unit

Posted on Mar 22, 2011

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Compressor no start in heat or cool mode


is this HEAT PUMP , SPLIT SYSTEM ? COULD BE LOW FREON PRESSURE SWITCH, LOW VOLTAGE SHORT OR BAD COMPRESSOR, RECOMMEND YOU GET A SERVICE COMPANY OUT FOR THIS ONE

Feb 24, 2017 | Heating & Cooling

1 Answer

Fan doesnt work on heat cool ok


Often the fan will cycle on and off on the heat mode. A cold air prevention mode is often built into modern Ac units whereby the indoor fan wont turn on until the internal system pressure is up to a certain point and heat is available to pump into the room. If the system cant come up to pressure or temperature then possibly the system is low on gas. Place your hand on the large pipe leaving the outdoor unit, it should be HOT when the system is on heating mode and running. If not Hot, then it is low on gas.

Feb 24, 2011 | Pace 18HPEWHEC Split System Air...

1 Answer

Bryant furnace model FX4C, FY4A with heat pump and a/c will not switch from a/c to heat pump. Only have heat with emergency heat on.


WELL this could be a couple of problems the reversing valve could be stuck either from not enough pressure which would be a leal and low on freon or the unit is off on low pressure switch/high pressure switch from either being low on freon or something restricting it and caused unit to shut down, ive been a servicer for many years and if it gets below 30 degrees outside i would recommend running the e-heat anyway it does cost more money minute for minute. but you will find it will heat alot faster in those colder nights than the heat pump therefore cost is about the same.
as far as not switching over could be low on freon or a stuck reversing valve... is the outside even running in cool mode if not the you may have a tripped pressure switch...good luck

Jan 04, 2011 | Bryant Heating & Cooling

1 Answer

Showing a LP on display. What are the possible problems?


Here is the reason for that problem per the manufaturers web-site

http://www.haywardnet.com/products/Manuals/pdfs/Manual122.pdf

The low-pressure switch senses the refrigerant pressure in the sealed refrigeration system to

protect against certain conditions that could be detrimental to compressor life. The switch shuts

the unit down in the event of loss of refrigerant, fan motor failure, evaporator freeze-up and

airflow blockage. The switch automatically resets when the pressure rises to normal operating

pressures. The display will show "LP" if this switch is tripped.

Evaporator Freezing

The low-pressure switch will shut the heat pump down when the evaporator starts to freeze.

When the unit starts to freeze the low-pressure switch will be tripped, causing the display to read
"LP" This will prevent the evaporator from becoming damaged or deformed.

If the air outside the heat pump is not warm enough to produce heat, the system will shut down.

The actual point at which your unit will shut down due to low temperature varies depending on

which model you purchased, current weather conditions, and the amount of sunlight reaching the

heat pump. The shutdown can occur anywhere within a wide range of temperatures, usually 45°F-

55°F. This is not a "fixed" range. We stress that climate conditions, sunlight, and various models

respond quite differently to low ambient temperature. A shutdown occurs because low

temperatures will activate the systems low-pressure safeguard switch (digital thermostats will

display a code "LP".) The unit will start up again when the temperature has raised enough to reset

this switch. Note: Low ambient temperature does not necessarily affect the Chiller models
or the cooling cycle of the heat/cool units.

If this post has helped you, please take the time to vote positively for me on this site. If you need additional help, I can be reached @: adamh@newconceptchem.com

thanks,

adam

Oct 23, 2010 | Hayward Heatpro 81k Btu Swimming Pool Heat...

1 Answer

I am working on a coleman self-contained a/c which is low on charge. it is for my sisters mobile home, what should the pressures be. Any other ways to check charge? The model # is 7330D901. Thank you very...


If it uses R22, with a 70F to 75F indoor temp, and a 70F to 80F outdoor temp, I would think the suction pressure would be 65 to 70 PSI. Liquid line pressure might be 200 to 250 PSI. On a warmer day, they could be higher. Granted, those pressures are for the cooling mode. If it is a heat pump, the pressures will be higher in the heating mode.

Jul 07, 2009 | Coleman Heating & Cooling

1 Answer

A/c cooling fine but not heating


The fan generally does not come on until the unit has achieved some high head pressure so that it can produce hot air. If it is low on gas it will not get to this stage.

Jun 26, 2009 | Heating & Cooling

1 Answer

Airconditioner LG LSk181-N2 shutting off


Sounds like your aircon is stuck on heating mode. Or. The outdoor fan speed is affected by ambient temperature, or low refrigerant. In heating mode the indoor fan will come on for a while to sense temperature and will then wait for the outdoor unit to pump up pressure and build up heat.

Feb 01, 2009 | LG LS-K1830CL Cool Mini Split Air...

2 Answers

My air conditioning unit is not blowing as cold as it did, nor is it blowing as hot as it did in the heating mode


90 percent of the time the freon charge is low and lack of freon lessens the amount of compressed heat that can be created and also the amount of heat that can be extracted. hence less cooling and less heating. however the exact same thing can occur when a change over valve gets stuck partially between heat and cool . it then mixes the hot and cold together and you get poor cooling and poor heating. you check it with a gage. fed law requires that you have an epa certification to apply a gage. low pressures in heat and cool on both high and low pressure gages are a sign of low charge. if low pressure and high pressure are close to the same on both gages then a good chance valve is stuck half way between. you can also sometimes check by feel . at the change over valve two lines should be virtually to hot to touch and two should be cold to the touch. one is heating flow and other is cooling flow. if the valve is stuck then temps will be within a few degrees of the same on all. low charge and the hot lines won't be hot hardly .and the cold line s barely cool. look for white frost forming in the heat mode outside at the condensor tubing shortly after you turn on the heat. thats a sign of low charge. good luck.

Nov 04, 2008 | Heating & Cooling

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