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Replacing the Cover and Circuit Board
Assembly
WARNING
All service to the heater must be performed by a
qualified electrician to reduce the risk of electric
shock or serious personal injury.
Follow the Pressure Relief Procedure on page 8
before continuing.
NOTE: Parts with ref. nos. 1, 3, and 20a–20h are
included in the cover and circuit board assembly (20).
To replace these parts, order 217184 for Heater Model
226816 or 217185 for Model 226819.
1. Remove the six old screws (3) and lockwasher (1).
Discard.
2. Swing the old cover (20a) into an upright position
on the heater housing edge.
3. Remove the old screw (20c) and lockwasher (20d)
from the threaded terminal in the lower right–hand
corner of the circuit board (20b) to disconnect the
black or white input wire (R). Discard the screw
and lockwasher.
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Service
4. Disengage the wiring harness female connector
(20e) from male connector in lower left–hand
corner of the circuit board (20b).
5. Unscrew the thermistor (20f) from the heater
housing. Discard the thermistor wiring harness.
6. Remove the nut (4) from the right heat element
terminal (W). Remove the small white wire (20g).
7. Remove the nut (4) from the left heat element
terminal (X) and remove the heavier black or white
wire (20h). Discard the cover and circuit board
assembly. Save the nuts (4).
8. Reassemble the new parts in the reverse order of
removal, being sure wires are routed carefully and
not in a position where they could be pinched
when installing the cover on the heater housing.
9. Tighten the screw (20c) and terminal (W, X) nuts
(4) securely.
10. Apply terminal grease (Part No. 110009) to the tip
of the thermistor (20f) before threading it into the
housing.
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