Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 7: TROUBLESHOOTING
Section 7.4
Section 7.4,
continued
After turning the
“Diesel”
switch
ON
:
TS4: The Aqua-Hot’s exhaust system sputters.
NOTE (7.4-A):
Before advancing to the following
procedures, be sure to check that the vehicle’s fuel
tank has a sufficient level of fuel.
Q1 : Is the Diesel-Burner’s
Fuel Nozzle
functioning properly?
I.
In order to determine if the
Fuel Nozzle
is
functioning properly, reference Section 8.6
and perform the Fuel Nozzle’s “Component
Test.”
A:
If the
Fuel Nozzle
is not functioning
properly:
The
Fuel Nozzle
must be
replaced; reference Section 8.6
for replacement instructions.
If the
Fuel Nozzle
is functioning
properly:
Continue troubleshooting.
Q2 : Is the Diesel-Burner’s
Fuel Supply System
functioning properly?
Quick Check:
With the
Diesel-Burner
ignited, listen for constant sputtering from
the Aqua-Hot’s exhaust system.
A:
If constant sputtering exists:
Continue troubleshooting.
NOTE (7.4-B):
Inspect the clear bowl of the
Fuel
Filter
for water. If water exists, be sure to purge
the Aqua-Hot’s entire fuel system prior to replacing
the
Fuel Filter
. Attempt heater restart; reference
“Illustration 7.4-1.”
I.
Clamp off and remove the Aqua-Hot’s
Fuel
Return Line
; reference Figure 1. Now attach
a short piece of fuel line to the Aqua-Hot’s
Fuel Return Port
and place the other end in
a container of diesel fuel. Remove the
clamp and ensure that the fuel line is com-
pletely submersed in the fuel, then, turn the
“Diesel”
switch
ON
.
Are air bubbles visible in the container of
fuel when the
Diesel-Burner
is operating?
(continued on next page)
2
1
4
3
output to
Aqua-Hot’s Fuel
"Supply" Port
input
from Fuel Tank /
fuel pick-up
Fuel Filter
TOP VIEW:
of Fuel Filter Head
Plug
Plug
RETURN PORT:
from Aqua-Hot’
"Return" Port
SUPPLY PORT:
to Aqua-Hot’s
Fuel Filter
dedicated
fuel pick-up
Fuel Pick-up Pipe Illustration
Clear Bowl
Illustration 7.4-1
Page 26
