Do you have a question about the 12403 series and is the answer not in the manual?
Questions and answers
KA
August 14, 2025
Hello, water flows fine from tap for a bit, around 500ml it slows down. I assume it is the filter. Is there anything I need to do
On the storage tank when I replace the 4 cartridges? My system is a series 12403. The manual says to check pressure on air valve located on base of tank. On my system there is no valve…there is only a plug on the bottom of the tank?
Economy reverse osmosis drinking water system (24 pages)
Summary of Contents for WaterGroup 12403 series
Page 1
OWNER’S GUIDE ADVANCED REVERSE OSMOSIS WATER TREATMENT SYSTEMS These models are tested and certified by WQA against NSF/ANSI 58 for the reduction of TDS. Tested and Certified by WQA Tested and Certified against WQA against ORD0902 for “lead free” CSA B483.1: compliance.
Page 2
Please fill in the following information and retain for reference: Unit Model Number: _________________________________ Serial Number: _____________________________________ Date Purchased: ____________________________________ Date Installed: ______________________________________...
Page 3
INTRODUCTION Congratulations, on the purchase of your new Advanced Reverse Osmosis Water Treatment System. Treated with care and regular maintenance, your new system will provide many years of service delivering great tasting water to the tap. By now, you have probably already opened the box to survey the contents. Please take a few moments to review this manual before proceeding with the installation and use of the system.
CSA B483.1 Tested and Certified by WQA against ORD0902 for “lead free” compliance. The following 12403 Series Reverse Osmosis Systems conform to NSF/ANSI 58 for the specific performance claims as verified and substantiated by test data. MODELS AND SYSTEM CONFIGURATIONS...
GENERAL INFORMATION This Owner’s Guide covers all components that may be included with a system. Information relating to any component that is NOT included with your system may be disregarded. SYSTEMS WITH AIR GAP FAUCET, MODEL 12403 REVERSE OSMOSIS SYSTEM PRODUCT WATER FAUCETS Item Description...
Page 6
GENERAL INFORMATION PRODUCT WATER STORAGE TANKS PRODUCT WATER STORAGE TANKS - ALL SYSTEMS Item Description Part No. Storage Tank Assembly, Polymer 92313 Storage Tank Assembly, Metal 92342/92294 Ball Valve, 3/8”, Steel Tank 33503601 Ball Valve, 3/8”, Plastic Tank 80704 Insert, 3/8” 92329 Figure 1.B: Product Water Storage Tanks.
READ THIS ENTIRE INSTALLATION AND SERVICE GUIDE BEFORE BEGINNING INSTALLATION The 12403 Series Reverse Osmosis (RO) Drinking Water Treatment Systems have been designed for ease of installation and serviceability and are constructed with the finest materials available. Using these instructions and paying close attention to the parameters outlined within "CONDITIONS FOR USE"...
WATER QUALITY MONITOR ® WaterGroup’s 12403 Series Reverse Osmosis Systems incorporate a proven performance indicator. Our patented Smartap Water Quality Monitor uses dual probe LOGIC PULSE MEMORY technology to accurately indicate membrane performance. A split-second power pulse compares feed water Total Dissolved Solids (TDS) level with that of the product water. Then, by reversing the polarity of the electronic pulse, the probes are cleaned and kept free of chemical plating.
Page 9
SADDLE-TAPPING VALVE INSTALLATION ON COPPER TUBE CAUTION: This saddle-tapping valve is not designed for installation on flex line tubing. NOTE: For installation in Massachusetts, the Massachusetts Plumbing Code 248 CMR shall be adhered to. Consult your licensed plumber for installation of this system. The use of saddle (piercing) valves is not permitted. 1.
Page 10
DRAIN OUTLET ASSEMBLY INSTALLATION NOTE: State, provincial and local plumbing codes may prohibit use of saddle-tapping drain connections and may require use of an air gap. NOTE: Location and orientation of drain outlet assembly is vital to system performance. Horizontal Drain Line: Vertical Drain Line: Locate drain hole as close as possible to top of pipe Locate drain hole on a straight length of drainpipe next to...
Page 11
PRODUCT WATER FAUCET SITE PREPARATION Refer to Faucet Installation Instructions (Page 6) for site location and mounting hole specifications. Primary considerations for site selection are convenience of use and an open area under sink. An existing 7/8” Sink Hole will also accommodate metal faucets with air-gap connections. Always check underside of selected location for obstructions.
Page 12
METAL PRODUCT WATER FAUCET INSTALLATION AND SYSTEM CONNECTIONS Install faucet on flat surface at least 2" in diameter. Unused 1 1/4" hole is ideal. Steps unique to a specific configuration are so noted. All other steps are common to either configuration. New Faucet Installation Connect loose ends of tubing as follows: Refer to Faucet Site Preparation, Page 5.
Page 13
Description Part No. Item Description Chrome Plated Metal Air Gap Faucet Body, Faucet (USEPA Compliant, not available in California) 92192 Faucet Base Washer, Rubber Faucet Base Washer, Metal Washer, Slotted (Air Gap, Slot Shape may vary) Spacer, Faucet (Air Gap) Washer, Faucet Nut, Faucet Connector, Faucet 3/8”...
Page 14
MODEL 12403 Item Description Part No. Cover, 4-vessel Push Button Manifold † 20500127 Screw, inlet Valve Cover 32701038 Cover, Inlet Valve 20500126 "O" Ring, Inlet Valve Cover 34201024 Shut Off Assembly 40600010 Tubing, 1/4”, White * 115200 Flow Restrictor, 1240 Series, Red 9 GPD 40600034 25 GPD...
ACTIVATING THE SYSTEM CAUTION: Make sure all water supply lines, drain lines, and fittings are secure and free from leakage. 1 . Open source water supply valve. Close product water Open product water faucet and let water flow until all air has been expelled from system.
Page 16
CLEANING, SANITIZING, AND CARTRIDGE REPLACEMENT PROCEDURE 1. Mix mild cleaning solution of dish soap and clean Clean filter housings and manifold ports, inside and potable water in plastic bowl. outside, with washcloth and cleaning solution. Do not use abrasive materials. 2.
Page 17
CLEANING, SANITIZING, AND CARTRIDGE REPLACEMENT PROCEDURE 19. CAUTION: Do not remove protective plastic bag from 28. Test battery connection by activating monitor. Press replacement filter/membrane cartridges until so push button. If an indicator light illuminates, instructed. connection is good. Install "O" rings into filter housings. Open top of filter 29.
Page 18
TROUBLESHOOTING INDICATORS AND COMMON SOLUTIONS Table 5 WATER VOLUME AND QUALITY Symptom Condition Action No product water. Water supply is turned OFF. Turn water ON. Not enough product water. Low water pressure. Check source water line pressure. Water supply is blocked. Clear restriction.
Other than the membrane, cartridge filters and battery, any part found defective within the terms of this warranty will be repaired or replaced by WaterGroup. If any part is found defective, WaterGroup also reserves the right to replace the drinking water appliance with a comparable WaterGroup drinking water system of equal or greater quality. You pay only freight for repaired or replaced parts from our factory and local dealer charges, including but not limited to labor charges, travel and transportation expenses and handling fees.
Need help?
Do you have a question about the 12403 series and is the answer not in the manual?
Questions and answers
Hello, water flows fine from tap for a bit, around 500ml it slows down. I assume it is the filter. Is there anything I need to do On the storage tank when I replace the 4 cartridges? My system is a series 12403. The manual says to check pressure on air valve located on base of tank. On my system there is no valve…there is only a plug on the bottom of the tank?