Service manual

— Page 63 —
© January 2013 Aqua-Hot
®
600-D01 Series Hydronic Heating System Service Manual - Rev. A
SECTION 9: DIESEL-BURNER COMPONENTS - TROUBLESHOOTING FLOW CHART
1 Check DC power supply at the
Electronic Controller.
2. Verify DC power at the Diesel
Switch (0) terminal on the JP2
Plug on the electronic Controller
NO
Is the Diesel Burner
Status Light on the
Electronic Controller
Illuminated Green?
Yes
Yes
Using a Jumper Wire, Jumper
the Diesel (I) and the Diesel
(o) Terminals together, on the
JP2 plug on the Electronic
Controller. If the Diesel
burner Status Light Illumi-
nates Green the problem is in
the motor Home, Either a
loose wire, bad switch, etc.
If the Diesel Burner Status
Light Does not Illuminate on
the Electronic Controller,
ensure that the JP2 plug is
securely plugged in. If it is
then the Electronic Controller
will need to be replaced.
NOTE: It is possible for the
Plug to be defective. It is rec-
ommended to remove the Plug
and check the pins on the elec-
tronic controller for power
using a digital volt meter.
NO
Is the Diesel Burner’s
Motor Operating?
Is the Heating Status
Light Illuminated
Green?
Yes
Is the Heater up to operating
Temperature? (I.E. above 155 ° F.)
NO
NOTE: The heating status light will
only illuminate green when either the
Diesel or Electric switch is in the on
Position, and the Control Thermostat is
calling for heat.
Turn the Burner
Control Switch ON.
Yes
NO
The Heater is
Functioning
Properly.
Yes
NO
1. Locate the JP8 Power Terminal
(also labeled B4 in), on the bot-
tom of the Electronic Controller.
Using a Digital Volt Meter,
verify that 12 VDC + is present
on the JP8 terminal. If 12VDC
+ is not present Either the metal
jumper between terminals B4 in
and +12V is not secure, or there
is a fuse blown in the Motor
Home.
2. Remove the Aqua-Hot’s Access
cover.
3. Check the Motor’s in-line fuse
for continuity. Replace if neces-
sary.
NOTE: The Indicator light will illu-
minate for only 30 seconds if the
motor fuse is blown (open circuit)
4. Attempt heater restart
1. Remove the Aqua-Hot’s Access
Cover
2. Remove the “Thermostat Access
Panel”
3. Check the Diesel Burner’s “VDC
High-Limit Thermostat” for conti-
nuity
NOTE: This thermostat protects
against overheating temperatures.
Is the indicator
light illuminated?