Aqua-Hot™ Motor Coach Heating System Owner's Manual 05/02
Aqua-Hot™ Motor Coach Heating System Owner's Manual 05/02
Failure Symptom
Probable Cause
Remedy
No Indicator Light on the
Diesel-Burner Control Switch or
Indicator Light goes Off after 30
sec.
Less than 10 Volts DC to the Aqua-Hot.
No Fuel to the Diesel-Burner.
Defective Fuel Nozzle.
Defective Indicator Light Bulb.
Check House Batteries and Charging System.
Check Fuel Filter and Fuel System.
Replace Fuel Nozzle.
Replace Indicator Light Bulb.
Diesel-Burner Control Switch is
On, but the Diesel-Burner’s
Motor does not function, see
Figure 2.
Loose Harness Plug Connections at the Control Unit.
Open “E” or “F” Fuse at the Aqua-Hot.
Less than 10 Volts DC to the Aqua-Hot.
Defective Diesel-Burner Control Switch or Loose Conn.
Check Harness Plug Connections to be secure and in
place on the underside of the Control Unit.
Replace “E” or “F” Fuse.
Check House Batteries and Charging System.
Replace Switch or Repair Loose Connection.
Diesel-Burner does not respond
with the 10-25 sec. Purge-cycle
Less than 10 Volts DC to the Aqua-Hot.
Check House Batteries and Charging System.
Diesel-Burner’s Combustion
Process does not take place.
Loose Harness Plug Connections at the Control Unit.
Open “E” or “F” Fuse at the Aqua-Hot.
No Fuel to the Diesel-Burner.
Defective Fuel Nozzle.
Check Harness Plug Connections to be secure and in
place on the underside of the Control Unit.
Replace “E” or “F” Fuse.
Check Fuel Filter and Fuel System.
Replace Fuel Nozzle.
Diesel-Burner’s Combustion
Process stops after 30 sec.
Loose Harness Plug Connections at the Control Unit.
Less than 10 Volts DC to the Aqua-Hot.
Check Harness Plug Connections to be secure and in
place on the underside of the Control Unit.
Check House Batteries and Charging System.
120 VAC Electric Heating
Element does not produce heat,
or hot water, when motorhome
is plugged into shore power.
VAC Breaker is Off or Switch is Defective.
Turn VAC Breaker On or replace Switch.
SECTION 5: TROUBLESHOOTING
Page 5-1
Prior to troubleshooting your Aqua-Hot, be sure to reference Figure 1 for a complete overview of the
heating system, and Figure 2 for a complete component overview of the Diesel-Burner. Also, please
review Section 2.5 of this manual for details on the Diesel-Burner’s operation. Use the following
chart when troubleshooting your Diesel-Burner only.
Use the following chart when troubleshooting your 120 VAC Electric Heating Element only.
CHECK OR REPLACE IF NECESSARY
Switc
h Indicator Light Bulb
Aqua-Hot ("E" & "F") Fuses,
Contin
uity ?
VDC
V
olta
g
e
Le
vel to Aqua-Hot
Diesel Contr
ol Switc
h
VDC
Wiring and B-Plug Harness Conn.
Fuel Suppl
y (No Fuel or air leak)
Fuel Nozzle
Diesel-Burner C-Plug Harness Conn.
FAILURE SYMPTOM
Diesel Control Switch "On"
No Function
Diesel Control Switch Indicator Light
No indicator light or "Off" after 30 sec.
Motor is not operating
No 10-25 second prime cycle
Diesel-Burner
Diesel-Burner
Diesel-Burner
Ignition Coil will not spark
Diesel-Burner
No Combustion
Diesel-Burner
Combustion stops after 30 seconds
COMPONENTS
120 VAC Heating Element
No heat / hot water when plugged into shore power
Engine Preheat
Diesel Engine Remains cold
V
A
C Cir
cuit Breaker
Engine Preheat Control Switch
No indicator light
Engine Preheat Contr
ol Switc
h
Aqua-Hot ("A") Fuses,
Contin
uity ?
SECTION 5: TROUBLESHOOTING
Aqua-Hot
Quick
Reference
Chart
Page 5-2
