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Water Heating Systems

Seisco Tankless Heaters

Electric Water Heaters

Getting Started

The SEISCO Tankless Water Heater is as simple to service as it is revolutionary. The following guide has been prepared to provide a detailed summary of all the service procedures that may be utilized by the service technician.

Diagnostic Features
Before You Start
Measuring Techniques
Troubleshooting Check List
Matching Procedure

Before getting into the technical guide one should remember that the proper operation of the Seisco depends on common sense requirements identified in the following.

  1. The Seisco must have proper voltage at each of its incoming power circuits. The top incoming circuit or the #1 circuit also provides power to the control board functions, including the LED status light.
  2. The Seisco has high temperature limit switches that will open when high temperature conditions have occurred and will prevent the heater from operating. So the high limit switches must be closed.
  3. The Seisco has water level detect circuitry that will prevent the heater from turning on if the water level inside the heater is low. There must be water in the heater for it to operate.
  4. There must be power to and through each element. Each power circuit requires the incoming power to pass through two relay devices, the first is a solid state switch and the second is a pair of electro-mechanical relays. If either of these switches is defective then its respective heating element cannot be turned on.
  5. The heating elements must operative. If an element is bad the heater will not perform optimally.
  6. The Seisco control depends on the temperature information it receives from each of the temperature sensors (3-5 number varying by model). If any sensor or its wires providing connection to the control panel is bad, the temperature information the control receives will be bad. The Seisco may not turn on at all or if it does the temperature may fluctuate.
  7. Finally, the control panel must be completely functional.

The information contained in the SEISCO Tankless Water Heaters Service Guide will assist the technician in properly testing each these components and/or circuits.


This guide was prepared for use by a qualified technician. no one should attempt service on the seisco unless he or she has the experience and skills to work on electrical equipment.

Don’t Assume! Always Follow the Pre-Service Check List!

Most service calls will probably be for no hot water, fluctuating temperature or not enough hot water symptoms. While most fall into these categories, there are other possible problems. All too often the service technician gets ahead of himself, fixes the symptom but not the problem. This leads to call backs and very unhappy customers who lose confidence in the technician. A simple and logical approach is to always follow the recommended Pre-Service, Trouble Shooting Check List below. The checklist will be helpful in identifying the cause and possible solution to the problem. After performing this check list follow the comprehensive trouble shooting solutions contained in the Component Testing and Trouble Shooting Tables of this section.

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