Aqua-Hot AHE-100-02S -12 VDC Owner's Manual page 41

Does a spark
appear across the
Ignition
Electrodes?
Yes
Remove shop rag from the "FLAME
DETECTION PHOTOCELL" (#13)
(see Figure 10), exposing it to a light
source. The spark should disappear.
Does a spark
disappear after the
Photocell is exposed
to light?
1. Replace "FLAME DETECTION
PHOTOCELL" (#13), see
Figure 10.
2. Reconnect "FUEL SOLENOID
VALVE" (#6) (see Figure 13)
wire.
3. Reattach "DIESEL-BURNER
Yes
HEAD" (see Figure 9) and
attempt heater restart.
Cover "FLAME DETECTION
PHOTOCELL" (#13) (see
Figure 10) again with a shop
rag. The spark should
reappear and continue for
approx. 15 seconds and then
switch off.
Within 15 seconds, after turning ON
the Control Switch, disconnect one
of the two wires from the "FLAME
No
DETECTION PHOTOCELL" (#13)
(blue or green), see Figure 10. A
spark should now appear across
the "IGNITION ELECTRODES"
(#8), see Figure 11.
1. Turn the control switch OFF.
2. Check "FLAME DETECTION
PHOTOCELL" (#13) (See Figure 10)
for proper operation by: Removing
both wires from the Photocell and
covering with a shop rag. When dark,
No
Photocell wire leads should read
300,000 ohms, or greater, of electrical
resistance. Remove shop rag and
expose to light; electrical resistance
should be 300 ohms or less.
Does the Photocell
No
operate properly?
Yes
1. Replace "CONTROL UNIT" (#1), see
Figure 7.
2. Reconnect "FLAME DETECTION
PHOTOCELL" (#13) (see Figure 10)
wires and "FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire.
3. Reattach "DIESEL-BURNER HEAD"
(see Figure 9) and attempt heater
restart.
1. Replace "CONTROL UNIT" (#1), see
Figure 7.
2. Reconnect "FLAME DETECTION
PHOTOCELL" (#13) (see Figure 10)
wires, "FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire and C-plug.
3. Reattach "DIESEL-BURNER HEAD"
(see Figure 9) and attempt heater
restart.
Aqua-Hot™ Hydronic Heating System Shop Manual
S S S S S ection 6: ection 6: T T T T T r r r r r oubleshooting ection 6: ection 6: oubleshooting oubleshooting
ection 6: oubleshooting oubleshooting
Does a spark
appear across the
Ignition
Electrodes?
Yes
1. Turn the Control Switch
OFF.
2. Check "IGNITION COIL"
(#3) for proper operation
by: Removing C-plug from
"CONTROL UNIT" (#1),
see Figure 7. Apply DC
power (+) to C-8 plug
(yellow wire) and ground
(-) to C-5 plug (brown
wire). A spark should now
appear across the
"IGNITION ELECTRODES"
(#8), see Figure 11.
Does the Ignition
Coil operate
properly?
No
Yes
1. Replace "IGNITION COIL"
(#3).
2. Reconnect "FLAME
DETECTION PHOTOCELL"
(#13) (see Figure 10) wire,
"FUEL SOLENOID VALVE"
(#6) (see Figure 13) wire and
C-plug.
3. Reattach "DIESEL-BURNER
HEAD" (see Figure 9) and
attempt heater restart.
REV-A 03/02
No
Page 16