Gas Tankless Water Heaters Troubleshooting

1.1 Model Number

World 2 Units:

2400ES
2700ES
GWH 715ES
GWH C800ES
GWH C920ES / GWH C920 ESC
Evolution 500 (WTD27, noncondensing, same as 715ES)
Integra 500 (WTD30, condensing, same as C800)

Therm Units (Pre-2013 units)

830ES
940ES
C950ES
C1050ES
C1210ES / C1210ESC

Greentherm (Post-2013 units)

C950ES
C1050ES
T9800 (guides are in process)
T9900 (guides are in process)

1.2 Instructions

This page contains enhanced screening guides for our nonclassic/ compact gas tankless water heaters.

If a contractor is not on site, you can go to the error code they are dealing with and see what some causes are under the "Why" section of the enhanced screening. This will give some direction the contractor can use when they are on site.Use the "Model Number" section to the right to find what type of design a particular model is (EX: 250SX is a World 1 design). Then go to that section below to find the guide for that unit.

NOTE:

Model numbers with a "C" at the beginning is a condensing unit. Model numbers with a "C" at the end is a commercial unit. The guide will contain a picture of the unit with the cover off. The error codes are listed on the sides with an arrow pointing to where in the unit the error code originates. Click on the error code you are dealing with and it will bring you to the enhanced screening page for that error that gives general reasons for the code and the questions to get answers for to record in ISM.

1.3 Tools Needed

Manometer - Used for testing gas pressure Digital Multi-meter Basic hand tools (wrench, screwdriver, etc.)

1.4 ISM Notes

General Code: CC-GAS-T Specific Code: Will be the error code the caller gives.