Heat pump is reading LP - Pentair MINIMAX NT TSI IGNITER

LP is an error message refering to the low pressure switch. For more information about it please refer to your owner's manual here. If you decide to persue attempting to repair it yourself and need further assistance, please reply to this post with a new comment or start a new post with your specific question(s).

John

The LP is for low pressure of the refridgerant. Your pump coils are either frozen, or the switch pressure switch is bad, or you are just low on refridgerant.

HOPEFULLY ITS STILL UNDER WARRANTY.
CALL HAYWARD OR GO TO HAYWARDPOOLS.COM.
THEY WILL SEND A LOCAL SERVICE REP TO COME ADJUST THE FREON LEVELS (LP).

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.

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thanks,

adam

Loss of refrigerant, bad motor for the fan clean the coils and unit as described in the manual. Here is a manual from the Hayward website or here http://www.haywardnet.com/products/manuals/pdfs/Manual122.pdf.

Low water pressure through the unit, you just need to adjust your valves to supply the right pressure to the heat pump.

This could be something as simple as a dirty filter. Heat pumps are notoris for pressure problems as they are very fickel. Make sure your filters are clean, then their should be a by-pass assembly on your inlet, outlet pipes for water this valve needs to be set at just the right spot to keep the water flow high enough to collect heat but not so high as to not warm enough. Setting this flow is easy enough with the unit on restrict the flow till the unit starts and wait to see that it keeps running. use a gentel hand and do this very slowley as the unit takes time to respond. But first make sure your filters are very clean and your baskets also. These are usually the culpret's when it comes to low pressure and low flow. The switch usually just tell's you that is where the problem is. If their is no corrosition or leaking at the pre. sw. more often than not it's ok and just tell's you to start looking for the problem. Good luck.

THIS IS A LOW PRESSURE CODE PROBABLY LOW PRESSURE SWITCH THE ONLY OTHER TIME THIS COMES ON IF ITS TOO COLD OUT SIDE