Fluid Level Sensor
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 21
Before continuing to the replacement procedure,
ensure that the unit has cooled to ambient temperature,
all power sources have been disconnected, and the
unit is completely shut off�
Replacement Procedure:
In order to replace the fluid level sensor, the overflow bottle
must also be replaced. Please visit www.aquahot.com or call
574-AIR-XCEL (574-247-9235)
to order the expansion bottle
kit. Once you have the replacement part in hand, follow the
procedure below.
1.
Locate the fluid expansion bottle.
2.
Clamp the overflow hose as close to the bottom fitting as
possible.
3. Grab a bucket or drain receptacle and place it directly
under the lower fitting of the expansion bottle.
4.
Remove the clamp from the lower fitting of the expansion
bottle.
5.
Remove the hose and allow the excess fluid to drain into
the bucket.
6.
Remove the overflow hose from the upper fitting of the
expansion bottle.
7. Remove the old expansion bottle, disconnect the Faston
connectors, and discard the old bottle.
8. Secure the new bottle in position.
9.
Crimp the new faston connectors to the new fluid level
sensor.
10. Connect these wires to their receptacles on the Aqua-Hot
harness.
11.
Reconnect the overflow hose to the upper fitting.
12.
Reconnect the expansion hose to the lower fitting.
13.
Fill the bottle with the previously drained fluid.
14. Remove the hose clamps.
15. Test the Aqua-Hot for normal functionality.
If additional assistance is required please contact the Aqua-
Hot Heating Systems Technical support department at 574-AIR-
XCEL (574-247-9235) from 7:00am to 4:00pm MST Monday
through Friday.
Fluid Return Port
Figure 29
Lower Fitting to
Fluid Return Hose
Upper Fitting to
Fluid Overflow Hose
Figure 30
Fluid Level
Sensor
