General Troubleshooting
General Troubleshooting
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
©Aqua-Hot®
125-DN1 Service Manual
REV 220421
p. 43
p. 42
Winterizing the Aqua-Hot
Not winterizing the Aqua-Hot when freezing
temperatures are present will result in serious
damage to the Aqua-Hot domestic water heating
system. Ensure that only non-toxic RV antifreeze (FDA
approved “GRAS” antifreeze for North America) rated
for winterization is used when winterizing this unit.
The warranty does not cover freeze damage.
Winterizing the Aqua-Hot
The Aqua-Hot’s domestic water heating system must be
completely drained of domestic water at any time the heater is
stored where freezing temperatures may be experienced.
Please follow these instructions when winterizing the Aqua-
Hot domestic water heating system. Reference Figure 87 below
for a system overview.
NOTE:
The Aqua-Hot can continue to be used for interior heat
once the domestic hot water system has been winterized.
1. Completely drain the fresh water storage tank using the
Low Port drain (Figure 85).
2. Disconnect the domestic water demand pump suction line
from the fresh water storage tank.
3. Attach an adequate piece of hose onto the suction side of
the domestic water demand pump.
4. Place the opposite end of the hose into an adequate supply
of non-toxic RV winterization antifreeze (FDA certified as
“GRAS” Generally Recognized As Safe must be used) and
allow the fluid to pump through.
5. Open and close all interior and exterior water faucets one
at a time, until ONLY pure RV antifreeze is present. Perform
this procedure for both cold and hot water faucets.
6. Remove the hose and reconnect the domestic water
demand pump’s suction line to the fresh water storage
tank.
Disinfecting the Domestic Water System
The Aqua-Hot Heating components are not compatible to
prolonged exposure to sodium hypochlorite (bleach or liquid
bleach). Using products containing bleach, including water
refreshers, may cause corrosion of the domestic water lines,
resulting in a catastrophic failure of the Aqua-Hot system by
creating leaks that cannot be repaired. This damage is not
covered by the Aqua-Hot warranty.
If disinfecting the hot water system, be sure to follow NFPA
1192 Standard of Recreational Vehicles “Instructions for
Disinfection of Potable Water Systems” or any other applicable
local standards for Potable Water Systems.
NOTE:
Extended exposure to household bleach will corrode the
components of the Aqua-Hot will potentially dramatically shorten
the operational lifetime of the Aqua-Hot. Under no circumstances
is the Aqua-Hot to be exposed to household bleach for extended
periods of time.
To Hot Water Faucets
Tempered
Domestic Hot Water
Fresh Water
Storage Tank
Cold Water Faucets
Demand Pump
Domestic Hot
Water Outlet
Figure 87
External Diesel Burner Troubleshooting
This section will cover any issues with the external diesel burner. The diesel burner is the primary heat source to the 125DN.
The troubleshooting procedures listed below are arranged in order of repair complexity. Do not replace parts without correctly
determining the failure.
Follow the directions below in order to troubleshoot the diesel burner. Do not skip through the troubleshooting steps, as this
may needlessly complicate unit diagnosis and repair.
Troubleshooting Procedure:
• Ensure that the system is supplied with electrical power and there are no blown fuses.
•
Ensure that there is at least ¼ tank of fuel in the vehicle fuel supply and the fuel filter is not clogged.
• Make sure all the electrical and plumbing connections are connected and secure.
• Ensure there are no faults for the burner. If there are, determine the fault and remedy.
The fault is indicated by a flashing “fault” light on the LCD screen during heater operation. It is indicated on the diagnostic screen
by the Burner Status ON/OFF indicator. There will be a series of rapid flashed, followed by 1 or more slow flashes. The rapid flashes
are an alert indicator; the slow flashes should be counted, as that is the fault code. Refer to the table below for the fault code.
FO1 (1 flash)
No start (after 2 attempts to start
FO2 (2 flashes)
Flame failure
F03 (3 flashes)
Under-voltage or over-voltage
F04 (4 flashes)
Premature flame recognition
F05 (5 flashes)
Not used
F06 (6 flashes)
Coolant temperature sensor interrupt or
temperature sensor short-circuit
F07 (7 flashes)
Fuel pump interrupt or short-circuited
F08 (8 flashes)
Combustion air fan motor interrupt or blower
motor short-circuit or incorrect speed
F09 (9 flashes)
Flame sensor interrupt or short-circuit
F10 (10 flashes)
Overheating
F11 (11 flashes)
Circulating pump interrupt or short-circuit
F12 (12 flashes)
Battery main switch short-circuit
F13 (13 flashes)
Output vehicle fan short-circuit
F14 (14 flashes)
Overheating sensor defective
F15 (15 flashes)
Pre-heating/ignition circuit defective
F16 (16 flashes)
Exhaust gas temperature too high
F17 (17 flashes)
Exhaust gas temperature sensor defective
After 5 short signals, count the long flashes:
F00 (continuous
flashing)
Burner interlock (lock-out
After the fault cause has been eliminated, the burner must be
switched on again.
Heater Lock-out Reset Procedure
The control unit continuously monitors the heater operation.
The control unit identifies errors on individual burner com
-
ponents and faults during operation. Should the control unit
experience component errors and operational faults, the
burner may be shut down and not restart.
The burner lockout reset must be done manually as shown
below.
Troubleshooting Procedure:
• Turn on the burner on the interior switch.
• Remove the main power connection to the burner or pull
the fuse for a minimum of 20 seconds.
• Turn the burner off on the switch.
• Reconnect the main power connection that was previously
disconnected.
External Diesel
Burner
Figure 88
Burner Troubleshooting
