Troubleshooting Hayward Heater - LP Code

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wille

wille

Bronze Supporter
Sep 20, 2019
83
Sarasota, FL
I am getting an LP Error on my electric Hayward heater, which signifies low water pressure. I have turned the valve that normally bypasses the heater to go through the heater. For the first 30 seconds, it reads the temperature of the water and then changes to LP. What should I do next?
 
LP code is low refrigerant pressure. What is your air temperature when it throws the code?

Hayward Heat Pro Heat Pump Flashes error code LP

Through online searches this stands for Low Pressure but sounds like it can be caused by a bunch of stuff other than just a freon leak, like a bad fan motor, start capacitor, control board, etc., etc. Since I don't have A/C gauges, would like to try to cross off anything I can before calling a...
www.troublefreepool.com www.troublefreepool.com
 
ajw22 said:
LP code is low refrigerant pressure. What is your air temperature when it throws the code?

Hayward Heat Pro Heat Pump Flashes error code LP

Through online searches this stands for Low Pressure but sounds like it can be caused by a bunch of stuff other than just a freon leak, like a bad fan motor, start capacitor, control board, etc., etc. Since I don't have A/C gauges, would like to try to cross off anything I can before calling a...
www.troublefreepool.com www.troublefreepool.com
Click to expand...
The air temperature is 62* when it throws the code.
 
You need to have someone with the gauges check the pressures. You may be low on refrigerant.
 
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It is hard to see details in the small pic that was posted but it looks like the bypass valve to the HP water input is closed. Check that valve is properly set.
 
Are you sure that you have Open and Closed figured out correctly?

When you open the line to the heat pump, are you closing the bypass line?

What is the filter pressure when the valve is open going to the heater and closed to the bypass?

What is the filter pressure when the valve is closed to the heat pump and open to the bypass?
 
The front of the handle has a point, which I think means that the water goes the direction of the point.

If the front of the handle had a wide fan, that would usually mean that the water is blocked where the wide fan is.

So, I think that in the picture, the water is going all to the heater and blocked to the bypass.

What is the manufacturer of the valve?

Can you verify which is open vs. closed?
 
JamesW said:
Are you sure that you have Open and Closed figured out correctly?
Click to expand...
Yes

JamesW said:
When you open the line to the heat pump, are you closing the bypass line?
Click to expand...
Yes

JamesW said:
What is the filter pressure when the valve is open going to the heater and closed to the bypass?
Click to expand...
When the valve is Closed to the heater, the filter pressure is 10.

JamesW said:
What is the filter pressure when the valve is closed to the heat pump and open to the bypass?
Click to expand...
When I Open the valve to the heater, the filter pressure is 15.
 
Last edited by a moderator:
JamesW said:
The front of the handle has a point, which I think means that the water goes the direction of the point.

If the front of the handle had a wide fan, that would usually mean that the water is blocked where the wide fan is.

So, I think that in the picture, the water is going all to the heater and blocked to the bypass.

What is the manufacturer of the valve?

Can you verify which is open vs. closed?
Click to expand...
I added some pics for a better look. The valves are Hayward.
 

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I'm not 100% convinced that the valve is being operated correctly.

Assuming the valve is being set correctly. You likely have a refrigerant leak.

A diagnostic service call will probably be over $100.00.

Finding and fixing the leak and then recharging is likely to be more expensive than it’s worth.

You can call for a service call if you like, but I wouldn’t put any significant money into the unit.

Maybe try a recharge to see how if that can give you another year or so. If the pressure is zero or very low, the leak is probably too bad.

If the refrigerant pressure is just below the trip point, a recharge might be worthwhile.
 

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