6
Error Codes
Code Description Possible Cause Corrective Action
How to Clear Error
Codes
050
Shorted temperature
probe.
Probe failure. Replace probe.
Turn main power
switch off and on.
051 Open temperature probe.
Bad probe connection,
or probe failure, faulty
wire, connectors,
contacts, etc.
Check all connections and
possible failing parts
Replace probe if
necessary.
Turn main power
switch off and on.
100
Initial Fill Error. Initial fill
time was more than 6
minutes.
Water supply flow rate is
too low.
Investigate cause of low
flow rate. (Clogged water
filter, etc.)
Press the control
panel power switch.
101
Error on refill. Tank did
not refill within 7 minutes.
Water supply flow rate is
too low.
Investigate cause of low
flow rate. (Clogged water
filter, etc.)
Error message is
cleared
automatically.
200
Flat Line Temperature
(Water is boiling).
Triac failure, bad output
on control board, or
temperature is set too
high for altitude.
Check triac, check control
board output, or adjust
temperature for altitude.
Turn main power
switch off and on.
201 Not heating.
Failure of heating
element, triac, triac
control board*, or main
control board.
Check and replace heating
element if necessary.
Check triac, triac control
board*, and main control
board.
Turn main power
switch off and on.
202*
Heater Short.
System is not calling for
heat, but temperature
rises more than 5°F.
Possible triac failure, or
bad output on triac
control board* or main
control board.
Check triac, triac control
board*, and main control
board.
Enter programming
mode, then exit
programming mode.
255** Keyboard error. Stuck button. Replace control board.
Turn main power
switch off and on.
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