Controller
Controller
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 15
p. 14
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 coach
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 coach-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
coach-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 coach thermostats.
The example in Figure 18 is showing the coach thermostat
is requesting it be 71°F in Zone 1. This is only available
with certain coach thermostats.
Outputs to RV (C):
The Outputs to RV indicates that the controller is sending power
to components within the coach. This section may also show
faults with components in each zone.
In the example in Figure 18, 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 coach, and it is not powering the zone fans.
A
B
C
Figure 18
Burner Status:
The Burner Status element on this page
indicates the status of the diesel burner.
LTCO Status:
The LTCO status indicates the sensor reading
from the Low-Temperature Cutoff Thermostat,
which is the device that governs whether to
provide heat or hot water.
LLCO Status:
LLCO status relays the current sensor reading
of the Low-Level Cutoff sensor within the
overflow bottle.
The LLCO is implemented to measure the fluid
level within the overflow bottle to ensure that
it does not drop below a safe threshold.
Tank Temperature:
The Tank Temperature status will display the
current temperature of the antifreeze and
water heating solution within the Aqua-Hot.
The ETS Thermistor (short for engine
temperature sensor) provides this temperature
information to the controller, which then
governs when the external gas burner and/or
electric element shut off.
Outputs to Aqua-Hot (D):
The Outputs to Aqua-Hot section describes the current status
of the controllable elements within the Aqua-Hot which are the
Burner Status, Fluid Circulation Pump, and the Electric Element.
This indicates only that the controller is attempting to operate
these elements, not their current functional status.
Inputs from Aqua-Hot (E):
The Inputs to Aqua-Hot will contain the current readings from
sensors within the Aqua-Hot. Four elements will be shown on
this page; Burner Status, LTCO Status, LLCO Status, and Tank
Temperature.
Figure 20
Figure 19
D
E
RV-Side
Connections &
Components
Inputs from RV
Outputs to RV
Aqua-Hot
Connections &
Components
Inputs from Aqua-Hot
Outputs to Aqua-Hot
Aqua-Hot 5in
LCD Screen
Aqua-Hot
Controller
