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If the unit is still not working do the following tests before proceeding.
Turn off the main power.
1.
Determine if the elements ohm to their correct reading…
:
Ohms Test:
Check each element(#4 in the above picture) with an OHMs meter for correct readings. If the elements
reads 0 or flickers it is bad and needs to be replaced. If the failed element looks like it was split from the inside it probably
failed due to air in the heater and you need to check the water source for a problem.
6KW 240 volts= 10 OHMS
6 KW 208 volts= 7.2 OHMS
6 KW 277 volts= 12.8 OHMS
5 KW 240 volts= 12.2 OHMS
4.5 KW 240 volts= 13 OHMS
4 KW 240, 6 KW 288 volts= 15 OHMS
3 KW 240 volts= 19.5 OHMS
2.
Test the thermostats(#3 in the above picture).
The thermostats have only a safety funtion in the CE series and
generally only fail in an overheating situation. They shut the unit down if the temperature inside exceeds their
setting. The thermostat can fail permanently if the water in the chamber overheats and if it goes over 260 degrees
Fahrenheit the fuse side of the thermostat will burn and the thermostat will never work again. The thermostat will
have continuity if the fuse side of the thermostat is still good.
The thermostats condition is determined by a continuity check AFTER POWER IS OFF AND AFTER COLD WATER HAS
BEEN RUN THRU THE HEATER TO RESET THE THERMOSTATS.
Continuity is tested between the arms on the thermostat. Occasionally, you get a false positive on a thermostat. It
may read as good but have a weak connection.
If a thermostat tests as “no continuity” the thermostat should be replaced.
3.
TEST the triacs. (#13 in the above picture)
The triacs allow powerto pass thru them once the gate valve is opened by
the computer board sending a signal thru the gate. This gate post is labeled #1 in the picture below and is smaller
than the other two posts. Take an ohms reading across posts one(gate) and two(power out) of the triac as labeled
in the picture below. It should read .63 ohms +/-. Then, check for continuity across posts two and three …which
are the outlet power and return power. Both these posts are larger than the gate post mentioned above. If you
have continuity the triac has shorted and must be replaced with the 800 volt triacs specified by the factory.
Summary of Contents for CE 12 KW
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