Fault codes / SeeLevel tank monitor / ntP / nbo

SeeLevel tank monitor: ntP / nbo

What it means: Stacked senders.

What to check

ntP = no top sender received. nbo = no bottom sender received. Both missing = OPn.

Learn the system

• Fresh water and the pump
• Plumbing leaks and fittings
• Winterizing and de-winterizing
• Tank sensors

Practice it on a service call

• Water pump quit
• Water pump kicks on by itself
• Toilet won't hold water

Guided diagnosis

• Water Pump
• Toilet

Other SeeLevel tank monitor codes

• SeeLevel tank monitor code OPn Open
• SeeLevel tank monitor code Sht Short
• SeeLevel tank monitor code Err Data error
• SeeLevel tank monitor: bot / toP / sin Single sender setup

Full field guide: SeeLevel II and Lippert MyRV tank monitor

Codes come from the maker manuals and public service sheets. Your model's own chart always wins, and LP and 120 volt work belongs to a qualified technician.