SECTION FOUR – Routine Maintenance and Professional Servicing
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The Thermistor is located in the uppermost well of the
Manifold under the left-hand Switch Cover.
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The Thermistor monitors the inlet water temperature.
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To check the Thermistor:
An open Thermistor displays E01 on the control board.
Ashorted Thermistor displays E02.
To replace the Thermistor:
1. Turn off the filter pump and all electrical power to
the heater.
2. If the heater is below the pool water level, close iso-
lation valves to avoid draining the pool.
3. Remove the Drain Plug under the Manifold to drain
the heater.
4. Unbolt and remove upper left and upper right jack-
ets to expose the Operating Control Assembly and
the Manifold Switch Cover.
5. Remove the Operating Control Assembly
(See Page 4-2).
6. Disconnect the Thermistor wires on the Control
Board (Connector J5).
7. Remove the Manifold Switch Cover.
8. Unscrew the Thermistor from the Manifold.
9. To replace the Thermistor, reverse Steps 1 through
8. Be sure to teflon tape the threads when rein-
stalling Thermistor.
4-4
PRESS
TAB
VENT
PILOT
O
F
F
OFF
ON
Thermistor
2653 1096
Thermistor
P/N 42001-0053S
