Question 1

Water won't stay in the bowl.

Accepted Answer

Possible cause: Either the base-to-bowl band clamp is loose, or the flush ball seal isn't sealing properly due to dirt, debris, wear, or damage.. Tighten the adjustment nut on the band clamp. Check the flush ball, and the underneath of its seal, for dirt or debris and clean if needed, or replace the flush ball/seal if worn or damaged.

Question 2

The flush ball won't close all the way.

Accepted Answer

Possible cause: Either the base-to-bowl band clamp is over-tightened, or the spring cartridge has weakened or failed.. Slacken the adjustment nut on the band clamp. Press the pedal and release it quickly - if it doesn't spring back, replace the spring cartridge.

Question 3

The water won't shut off in the toilet.

Accepted Answer

Possible cause: Dirt lodged in water valve seal, lever is bent down, water valve worn/defective, or spring cartridge weak/defective.. Take the water valve apart and clean it, bend the lever's front up around 0.1in (2mm), and replace the water valve assembly or spring cartridge if needed.

Question 4

Water isn't entering the bowl properly.

Accepted Answer

Possible cause: Low incoming water pressure or clogged water valve filter screen.. Check the incoming water pressure (35-40psi), then remove and clean the water valve's filter screen.

Question 5

Water's leaking from the water valve.

Accepted Answer

Possible cause: Loose connection, worn/defective water valve, improperly seated water line connection, stripped threads, worn/missing seal, or cracked valve body.. Tighten the bottom cap, inlet fitting, and discharge hose band clamp. Ensure threads are not cross-threaded and tighten. Replace the water valve assembly if parts are worn, stripped, cracked, or missing.

Question 6

Water is leaking out at the back of the bowl.

Accepted Answer

Possible cause: Loose water supply hose connection, loose check valve assembly, worn/defective check valve, or cracked bowl.. Tighten the hose connections on the water supply and check the valve-to-bowl joint. Replace the check valve assembly, or the bowl itself if it's cracked or faulty.

Dometic Gravity-discharge Toilet

Technical Specifications

Master Troubleshooting & Diagnostics Matrix

Error Code / Indicator	Symptom / Meaning	Possible Cause	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Water won't stay in the bowl.	Either the base-to-bowl band clamp is loose, or the flush ball seal isn't sealing properly due to dirt, debris, wear, or damage.	Tighten the adjustment nut on the band clamp. Check the flush ball, and the underneath of its seal, for dirt or debris and clean if needed, or replace the flush ball/seal if worn or damaged.	DIY Safe
`N/A`	The flush ball won't close all the way.	Either the base-to-bowl band clamp is over-tightened, or the spring cartridge has weakened or failed.	Slacken the adjustment nut on the band clamp. Press the pedal and release it quickly - if it doesn't spring back, replace the spring cartridge.	DIY Safe
`N/A`	The water won't shut off in the toilet.	Dirt lodged in water valve seal, lever is bent down, water valve worn/defective, or spring cartridge weak/defective.	Take the water valve apart and clean it, bend the lever's front up around 0.1in (2mm), and replace the water valve assembly or spring cartridge if needed.	DIY Safe
`N/A`	Water isn't entering the bowl properly.	Low incoming water pressure or clogged water valve filter screen.	Check the incoming water pressure (35-40psi), then remove and clean the water valve's filter screen.	DIY Safe
`N/A`	Water's leaking from the water valve.	Loose connection, worn/defective water valve, improperly seated water line connection, stripped threads, worn/missing seal, or cracked valve body.	Tighten the bottom cap, inlet fitting, and discharge hose band clamp. Ensure threads are not cross-threaded and tighten. Replace the water valve assembly if parts are worn, stripped, cracked, or missing.	DIY Safe
`N/A`	Water is leaking out at the back of the bowl.	Loose water supply hose connection, loose check valve assembly, worn/defective check valve, or cracked bowl.	Tighten the hose connections on the water supply and check the valve-to-bowl joint. Replace the check valve assembly, or the bowl itself if it's cracked or faulty.	DIY Safe