Aqua-Hot AHE-100-02S, Service Manual

Page: 48 / 106

— Page 48 —
© 2011 Aqua-Hot
®
AHE-100-02S Hydronic Heating System Service Manual—Rev. B
Does the spark
reappear?
1. Turn the Control Switch OFF.
2. Reconnect “Fuel Solenoid Valve” wire.
3. Remove both ignition wires from the “Ignition Electrodes” or
connect a jumper wire across the Electrodes.
To prevent a HIGH VOLTAGE shock and or a fire hazard, be sure to
remove both “Ignition Electrodes” (tape the ends and separate the
wires) or connect a jumper wire across the Electrodes.
4. Turn the Control Switch ON. After approx 20 seconds the “Fuel
Solenoid Valve” should receive power from the “Control Unit”. A
fine mist of fuel should appear from the “Fuel Nozzle”.
1. Turn the Control Switch Off.
2. Replace the “Control Unit”.
3. Reconnect “Fuel Solenoid Valve” wire.
4. Reattach “Diesel Burner Head” and attempt
heater restart..
Is a mist of fuel
(Cone-Shaped)
present?
NO
Yes
1. Replace “Fuel Solenoid Valve”.
2. Retest fuel flow (without Fuel Nozzle).
3. Install “Fuel Nozzle”.
4. Retest Fuel Nozzle spray pattern (fine mist
of fuel present?).
5. Reconnect Ignition wires to “Ignition Elec-
trodes” or remove jumper wire.
6. Reattach “Diesel Burner Head” and attempt
heater restart.
1. Turn the Control Switch Off.
2. Reconnect ignition wires to
“Ignition Electrodes” or re-
move jumper wire.
3. Reattach “Diesel Burner
Head” and attempt heater
restart.
1. Turn the Control Switch Off.
2. Remove “Fuel Nozzle”.
3. Turn the Control Switch ON.
After approx. 20 seconds fuel
should flow freely from the
fuel nozzle port.
NO Yes
Does fuel flow
freely from the
port?
NO 1. Turn the Control Switch
OFF.
2. Check “Fuel Solenoid
Valve” for proper operation
by: Removing both wires
from the Solenoid Valve and
applying VDC Power (+) and
ground (-) to the Solenoid
Valve electrical terminals.
“Fuel Solenoid Valve”
should click when VDC
power is applied.
Does the Solenoid
Valve operate
properly (click)?
NO
NO
Yes
Yes
S
ECTION
8: D
IESEL
-B
URNER
C
OMPONENTS
/T
ROUBLE
S
HOOTING