U-Line Outdoor Nugget Ice Maker P1: Pump Circuit Reads Open
P1 on a U-Line Outdoor Collection nugget ice maker such as the UONB115 means the control sees the water pump circuit as open, so ice making stops. The clear ice UCLR1215 shows the same message as Pi.
What does U-Line ice machine code P1 mean?
Among the U-Line Outdoor Collection nugget ice makers, the UONB115 shows P1 when the water pump circuit is open. The control expects that circuit to be complete whenever it needs water moving, and it reads an open path instead. Without the pump the machine cannot circulate water, so ice making stops and P1 remains. The clear ice UCLR1215 spells the same message Pi, and that code has its own page.
P1 at a glance
- Code
- P1
- Appliance
- U-Line ice machine
- Applies to
- Outdoor Collection nugget ice makers from U-Line, UONB115 included
- Type
- Needs attention soon
- Can you clear it yourself?
- Sometimes, after the safe checks below
- Most likely cause
- A drain line that is kinked or restricted and holding water back
What you may notice with P1
- P1 appears on the display of the ice maker
- No new ice is arriving in the bin
- You may not hear water being circulated inside the machine
How the ice machine detects P1
The water pump on a U-Line nugget ice maker moves water through the machine while ice is being made, and the control checks that the pump circuit is complete before it relies on it. A complete circuit tells the control the pump is connected and able to run.
On the UONB115 and other Outdoor Collection nugget models, an open reading triggers P1. The control cannot tell by itself whether the pump has stopped working, whether a restricted drain is holding water back, or whether the circuit is simply open. It stops ice making rather than run without water movement, and P1 remains until the pump circuit reads normal.
Likely causes of P1
- A drain line that is kinked or restricted and holding water back
- A water pump that has stopped working
- A pump circuit that is open, so the control cannot see it as complete
Can you keep using the ice machine with P1?
Ice making stops while P1 is on the display, so there is nothing to gain by leaving the machine running. Switch it off for a few minutes and check the drain hose behind it for a kink. If P1 returns, keep the machine off, because a unit that cannot move water may let it collect where it does not belong. Leave it switched off until the pump and drain have been tested.
What you can safely check
- Switch the ice maker off at its control or unplug it, and let it rest for a few minutes before you look at anything.
- Go behind the unit and see whether the drain line is kinked or flattened.
- Move away any box or loose object resting against the drain hose.
- Switch the machine on and watch whether P1 comes back.
- If P1 shows again, leave the ice maker off and call us.
What our technician does for P1
- Check the drain path for a restriction before touching the pump
- Test the water pump and read whether it completes its circuit
- Replace the pump or repair the open circuit once the test names the cause
How to keep P1 from coming back
- Keep the drain line behind the machine straight and clear of anything stacked against it.
- Check now and then that nothing has shifted against the hose after cleaning or moving boxes nearby.
- On an outdoor unit, rinse leaf litter and debris away from the drain area after Florida storms.
Technical reference
- Code
- P1
- Appliance
- U-Line ice machine
- Control family
- Outdoor Collection nugget ice makers from U-Line, UONB115 included
- Maker documentation
- U-Line owner manuals and support
- Checked
- November 2026
Code meanings come from the maker’s documentation and our own repair work; we do not reprint the maker’s document. Confirm the full model number before acting on a code. We are an independent repair company, not affiliated with U-Line Corporation.
Related U-Line ice machine error codes
P1 questions
Will my nugget ice maker still make ice with P1 showing?
No. Water cannot be circulated while the control reads the pump circuit as open, so ice making stays stopped as long as P1 is on the display.
Why would a drain problem show up as a pump code?
A restricted drain line holds water back, and the control reports the result through the pump circuit message. That is why the drain is the first place we look before replacing the pump.
Is P1 the same code as Pi?
They describe the same open pump circuit. The nugget UONB115 shows P1, while the clear ice UCLR1215 prints Pi, so the letters differ but the meaning does not.
What happens if I keep running the machine with P1 showing?
Water has nowhere useful to go when the pump circuit stays open, so a machine left running may let it collect in places it should not. Switching the unit off is the safer choice until it is tested.
What should I tell the technician about P1?
Say it is a nugget model, give the model number such as UONB115, and mention whether the drain line behind the unit looked kinked. That helps decide whether to start with the drain or the pump.
Need help with P1?
A technician finds the cause at your bar or lanai and puts the price in writing before any part comes out.