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Fault
Code
Description
Displayed
E37
No Water Flow.
E99
Board Failure.
Lockout types:
Continuous. Needs "Cycle the Power" or service to restart.
Soft. Will try to automatically recover and restart after 20 minutes.
Auto Reset. Will automatically restart when voltage returns to acceptable parameters.
Cause
The heater could not start
because the water fl ow was
not established. This can be
caused by an air bubble or a
blockage in the heat engine
water passage, a failed fl ow
sensor or a failed circulation
pump.
An internal diagnostic check
on the board has failed.
TABLE 4
Lockout
type
1.
Check the water inlet on the heat
engine.
2.
Make a water draw during fi rst 60
seconds after putting the unit in ON
mode (to evacuate possible air from
the heat engine water passage).
3.
Check wire harness for pump, water
Soft
valve and water fl ow sensor.
4.
Check the pump 120Vac voltage
supply (the pump shall be energized
during the heating mode).
5.
Clean or change the water fi lter.
6.
Change Control Board.
7.
Change pump.
8.
Change water valve.
Soft
Change the Control Board.
Remedy
51
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