Controller
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 19
Failure to disconnect all power supplies and/or allow the
unit to cool before servicing could cause serious damage or
personal injury.
Components
Introduction:
This section of the Service Manual details various
components of the Aqua-Hot that may require troubleshooting
and/or replacement in the event of malfunction.
Replacement parts can be ordered online through Aqua-
Hot’s webstore at www.aquahot.com.
If additional assistance is needed, the technical support
team can be contacted at 574-AIR-XCEL (574-247-9235)
Monday through Friday, 7am to 4pm Mountain Standard Time.
Interlock Switch
The interlock switch is a safety device designed to ensure
that the Aqua-Hot’s access cover is securely installed before
the burner will operate.
Troubleshoot the interlock switch if the following conditions
occur:
• The burner fails to operate
• The burner status does not show ON on the LCD screen
or RV control panel with the burner on
Troubleshooting:
1.
Ensure that the boiler tank has sufficiently cooled in
order to require heat from the burner.
2. Activate the burner located on the interior control panel.
3. Locate wires #12 and #24 on the wiring harness as they
lead into the interlock switch.
4. Disconnect the wires from the switch, noting that wire
#24 is connected to the terminal labeled “NO” and #12
is connected to the terminal labeled “COM”.
5. Using an ohmmeter, check the interlock switch for
continuity while the switch button is manually depressed.
6. If continuity is not present with the button pressed in,
follow the instructions in this section to replace the
interlock switch.
Replacement Procedure
1. Disconnect the interlock switch wires by pulling the
quick connectors from the switch spade terminals.
2. Release the interlock switch from the Aqua-Hot cabinet
by pushing in on the locking tabs and pulling the
interlock switch.
3. Remove the defective interlock switch from the Aqua-
Hot.
4. Install the replacement interlock switch into the Aqua-
Hot ensuring that the locking tabs snap into place.
5. Connect the Aqua-Hot’s replacement wires to the
replacement interlock switch with wire #24 connected
to the terminal labeled “NO” and wire #12 connected to
the terminal labeled “COM”.
NOTE:
Before attempting to troubleshoot any Aqua-Hot
component, please check all wiring to ensure that there is
no corrosion, loose and/or faulty wiring connection present
which may be causing failure.
Locking Tab
Wire #24
“NO”
Wire #12
“COM”
Button
Figure 24
Figure 25
Interlock
Switch
Interlock Switch
