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T series Troubleshooting

This piece of equipment requires an experienced electrician to repair. Do not attempt to repair this unit without the appropriate experience


Fluctuations in temperature are normal in some cases, especially when the temperature outside drops in a short period of time and causes the incoming water temperature to lower. This fluctuation is caused by a wider range of temperature rise (refers to the ground temperature of water) that the heater has to accomplish to accommodate your hot water applications and does not indicate a problem with the heater. The fluctuation will correct itself as the temperature warms if this is the case. Clicking on and off infrequently once or twice a day is normal. There may be one or two ounces of water in the heat exchanger, which the heater senses. Once the heater determines the flow of water, the system shuts off.

There is a pilot light on the right side of the heater that will come on when the breaker is engaged.

There are two lights on each side of the heater that indicate the operation of the specific elements that they are connected to. The elements and thermostats are numbered from right to left. The lights are numbered from bottom to top on the right side and then to the left side of the unit.

If any one of these four lights do not come on when the heater is operating under a full load then

1. Shut off the breakers and the pilot light will go out.
2. Test the thermostat that relates to the light for continuity. If there is no continuity it will have to be replaced.
3. Test the element that relates to the light for proper ohms. The ohms reading on the element should be a steady reading as shown on the following schedule.

T 12 2    10 ohms
T 14 2      8 ohms
T 16 2      7 ohms
T 18 4     13 ohms
T 24 4     10 ohms
T 28 4      8 ohms
T 36 6     10 ohms

If the ohms reading is 0 or it is not steady and close to the numbers above it will have to be replaced.

4. Check each of the fuses for continuity and replace if necessary. These are for safety and if one of them has failed you need to assess why and fix the problem before operating the heater again. It could be an element that failed, caused a short , and burnt the fuse.

5. Check each of the bottom thermostats for continuity and replace if necessary. These are safety thermostats and normally do not wear out. If one of them has failed you need to assess what caused the problem and fix it before using the heater again.

6. The assembly drawing shown below relates to the T 24 4 unit but all parts are comparable for other heaters in the line. It should help answer any questions you may have about how the unit operates.

If you are still having trouble please fill out the Troubleshooting form.  Filling out and sending us the form at the right will enable us to determine the status of your warranty and also allow us to prepare for the call from your electrician. You can fax them at 941-755-6529 or email them to info@hotwaterheater.com This will expedite the process of getting your heater back into optimum operation.
Tankless, Inc. 2060 Whitfield Park Ave., Sarasota, FL 34243 Phone: 1-800-TANKLESS 1-800-826-5537

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