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RESETTING THE COMPUTER BOARD:
1) Verify that there is no water flowing through the
unit.
2) If a temperature remote controller has been
installed, turn the power off to the remote.
3) Turn off power to the unit, and then turn on again.
4) Push and hold the "INC" and "DEC" buttons on the
computer board simultaneously for several seconds
until the red LED lights up solid. See Figure 5.26.
5) Use the Power ON‐OFF switch to turn the unit off
then on again. The computer board is reset.
CHECKING THE OVERHEAT CUTOFF FUSE (OHCF):
1) Locate the white OHCF which wraps around the heat exchanger.
2) Find the white clip at the end of the two blue braided wires coming from the OHCF.
3) Unplug the connection.
4) Test for continuity at the end of the OHCF with
an ohmmeter. If there is continuity, the OHCF is
still intact. Reconnect the plug. If there is no
continuity, the OHCF has been compromised. If
compromised, contact the technical service
department for further assistance.
5) If an ohmmeter is not available, jump the plug
connection on the opposite side of the OHCF with a wire, paper clip, or other metal
material.
6) Restore power and test unit. Be very cautious with this step, avoiding contact with the
jumper device or any other electrical wires.
7) If the unit fires up, it shows that the OHCF has been compromised and the problem was with
the OHCF. If so, contact the technical service department for further assistance. If the unit
does not fire up, it shows that the cause of the 111 or 121 error code is something else.
Continue with the 111 or 121 error code sections of this guide for further troubleshooting.
"Increase" button
Figure 28
Figure 29
26|
Page
Troubleshooting Guide
Red light
"Decrease" button
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