Fluid Level Sensor
Fluid Level Sensor
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 21
p. 20
Fluid Level Sensor
Introduction:
The fluid level sensor monitors the current fluid level within
the Aqua-Hot. This device is intended as a fail-safe measure
which will disengage the Aqua-Hot if the fluid ever drops below a
set threshold. The fluid level sensor is located on the expansion
bottle, which is either mounted to the side of the unit (see
Figure 37), or within the coach.
If the fluid level sensor is malfunctioning, the Aqua-Hot
will show no signs of operation whatsoever. Troubleshoot this
sensor if there is an adequate amount of fluid present within
the Aqua-Hot, and the unit does not operate.
Troubleshooting Guidelines:
Before troubleshooting the fluid level sensor, ensure that the
following requirements have been met.
•
The fluid expansion bottle is filled to at least the “COLD”
mark.
• Verify that all coach-side in-line fuses are functional.
• Ensure that the unit is completely cool.
• Ensure that DC electrical power is supplied to the Aqua-Hot.
• Ensure that AC electrical power is supplied to the Aqua-
Hot’s electric element.
•
Ensure that the fluid level sensor is oriented correctly (see
below).
If any of the requirements above are not fulfilled, correct
them before continuing to diagnose the fluid level sensor.
Reference the troubleshooting guide to the right.
Locate the fluid level
sensor (Figure 35)
Using a multi-meter, test
for continuity across the
fluid level sensor
Does the fluid level sensor
have continuity?
Yes
No
Yes
No
Fill fluid
expansion
bottle. Re-
test Aqua-
Hot.
Replace the
fluid level
sensor
Is the fluid expansion
bottle filled to at least the
COLD position?
Locate the 5in. LCD screen
Navigate to the INPUTS
FROM AQUA-HOT section.
HOME-->Aqua-Hot
Diagnostics --> DIAG
Locate “LLCO.”
Does LLCO display TANK
FULL?
Yes
No
This fluid
level
sensor is
functioning
as intended
Replace the
controller.
Troubleshooting Procedure:
Figure 35
Figure 36
Fluid Level
Sensor
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 +1 (800)
685-4298 from 7:00am to 4:00pm MST Monday through Friday.
Lower Fitting
Upper Fitting
Figure 38
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.
Figure 37
Expansion Bottle can either
be found mounted to the
side of the Aqua-Hot unit or
within the coach.
