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E37
No Water Flow.
The heater could not start
because the water flow was
not established. This can be
caused by an air bubble or a
blockage in the heat engine
water passage, a failed flow
sensor or a failed circulation
pump.
Soft
1. Check the water inlet on the heat
engine.
2. Make a water draw during first 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
valve and water flow sensor.
4. Check the pump 120Vac voltage
supply (the pump shall be energized
during the heating mode).
5. Clean or change the water filter.
6. Change Control Board.
7. Change pump.
8. Change water valve.
E99
Board Failure.
An internal diagnostic check
Soft
Change the Control Board.
on the board has failed.
TABLE 4
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.
Part Number 320169-001
dRaFt Jun 9 130
51
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