Controller
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 12
necessary to utilize the DIAG screens, which will be explained
next.
Diagnostic Screens (DIAG)
The diagnostic screens will show the current operational status
of different elements within the Aqua-Hot. By comparing these
operational statuses against the expected results it is possible
to discern operational issues.
Shown below are the diagnostic screens. From these screens it
is possible to see the current status of elements within both the
Aqua-Hot and the status of certain elements within the RV such
as zone thermostats and on/off signals. Each element on the
screens listed below will be explained in detail.
Operating Mode (A):
The operating mode contains six items which relay at-a-glance
information about the function of the Aqua-Hot.
System Voltage:
This section of the Operating Mode page
indicates the status of the supply voltage to the
Aqua-Hot. This will display “OK” if the supply
voltage is between 11V DC and 16V DC.
If this element displays anything except “OK”
begin troubleshooting the RV-side voltage.
Burner:
This indicates the current burner status as
either ON, OFF or FAULT. ON indicates that the
burner is active, and able to fire to provide heat.
OFF indicates that heat is either not required or
not requested by the controller.
FAULT indicates that there is an issue with the
burner.
Electric:
The Electric section indicates the controller’s
current handling status of the AC electric relay.
This status indicates that the controller is
attempting to activate the element relay only.
This does NOT indicate whether the electric
element is in working order or not.
Heat Zone #:
The next three elements indicate the current
status of the heating zones (maximum 3).
This element (ON or OFF) only indicates that
the zone thermostat is requesting heat, AND
that the controller is providing power to the
zone fans.
Inputs from RV (B):
The Inputs from RV section will display the signals received
from within the RV as pertaining to the RVC network and the
heating zone thermostats.
With respect to the zones, there will be three different items
displayed next to the Zone # items depending on the type of
RV-side thermostat in use.
• ON: This indicates that the zone is active, and the zone
thermostat is calling for heat
• OFF: This indicates that heat is either not needed, or not
requested by the zone thermostat
• 71°: This indicates the set-point of the RV thermostats.
The example in Figure 7 is showing the RV thermostat is
requesting it be 71°F in Zone 1. This is only available with
certain RV thermostats.
Outputs to RV (C):
The Outputs to RV indicates that the controller is sending power
to components within the RV. This section may also show faults
with components in each zone.
In the example in Figure 7, the controller is not sending power
to the boost pump, so the boost pump is shown as OFF.
Zone 1 is ON, meaning that the controller is sending power to
the Zone 1 fans.
Zone 2 is Over Current, indicating that there may be a problem
with the fans in this zone.
Zone 3 is not active. The controller is not receiving a request for
heat from the RV, and it is not powering the zone fans.
A
B
C
Figure 7