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SELF DIAGNOSTIC CODES 
SEISCO Tankless Water Heaters  
 
READING THE CODES.
The LED status light located on the control panel will flash a three-part sequence of red flashes, each representing one of three single numeric values. After each such sequence, the LED will momentarily reset and return to flashing green and then again return to flashing red the diagnostic code.
 
Each part of the sequence begins with a red flash or flashes followed by a pause, then the next part of the three parts sequence and again a pause and finally the last part of the sequence. Count the number of red flashes in each sequence.
 
For example, green flashing then one (1) red flash followed by a pause, (the is 1), then two (2) red flashes followed by a pause (this is 2), and finally four (4) red flashes followed by a pause (this is four), thus the code is 1-2-4, after which the LED status light will return to Green before beginning a new code sequence.
 
REMEMBER THERE MAY BE MULTIPLE CODES SO VERIFY EACH SEQUENCE. If you wish to hear the audible alarm that corresponds to the red flashes, simply press the small blue mode button on the control panel for 2 seconds, after which it will beep a sequence of beeps corresponding to the flashing red sequence.
 
This beep is particularly useful if you or the customer wants to allow someone to hear the code from a phone and assist.
 
Diagnostic codes are a useful tool for troubleshooting, however, Seisco heaters can be diagnosed without the codes. Occasionally, a problem may occur that does not trigger a diagnostic code. If this happens, refer to the following Trouble Shooting Table. Try to match the problem or symptom with the problem or symptom given in the table. Then work through the corrective action or procedure given in the Table.
 
All the diagnostic codes can be found in the Diagnostic Code Table with corresponding corrective procedures. If the problem cannot be determined or solved by using this Tankless Water Heaters Service Guide, qualified personnel are available during normal working hours (Monday-Friday, 8 — 5 PM Central Time) by calling 888-296-9293. Also, check for local 24-hour service companies in your area that may be available for assistance.
 
Now you have successfully followed the procedures and have the information you need to properly trouble shoot the problem using the following Trouble Shooting Table.
 
It is very important that you haven’t tried to skip to what would be quick fixes without fully evaluating the system through these prior diagnostics steps.