Aqua-Hot Hydronic Heating System Shop Manual 09/04
®
SECTION 7: TROUBLESHOOTING
Section 7.11,
continued
Does the Electronic Controller’s
Engine
Preheat Pump
light now illuminate?
A:
If YES:
Check for loose wire connections
at the
“Engine Preheat”
switch
and at the JP-2 Plug’s
Preheat (O)
and
Preheat (I)
pins; reference
Appendix A. If connections are
in good condition, the
“Engine
Preheat”
switch must be
replaced. Please contact the
Technical Support Department at
1-800-685-4298 for assistance.
If NO:
Locate the Electronic Controller’s
JP-2 Plug
and check for DC
voltage at the
Preheat (O)
pin;
reference Appendix A.
NOTE (7.11-B):
Be sure to utilize the
“JP7 GND”
stud
as a
ground (-)
source when performing this
DC voltage check.
If no voltage is present:
The
Electronic Controller
must be
replaced. Please contact the
Technical Support Department at
1-800-685-4298 for assistance.
If voltage is present:
Reference “NOTE (7.11-C).”
NOTE (7.11-C):
If the
Engine Preheat Pump
still
does not appear to operate after performing all of
the listed checks, contact the Technical Support
Department at 1-800-685-4298 for additional
assistance.
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