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DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLE SHOOTING
These instructions are applicable for MH75KT / HS75KT, MH125KT / HS125KT, MH175KT / HS175KT, and MH210KT / HS210KT.
This heater is equipped with a diagnostic control board and flashing LED error indicator. This flashing LED signals when there is a malfunction
of a monitored component. See the following dianostic guide for error signal and brief description of the error.
LED
CAUSE
1 Flash
System Lockout
(High limit switch Open Circuit)
System Lockout
2 Flashes
(Sparks, calling for flame, but
no or slow motor operation)
3 Flashes
System Lockout
(No Spark)
System Lockout
4 Flashes
(Abnormal Motor Operation -
Motor overheats or Stops)
5 Flashes
System Lockout
(Reset button Error)
System Lockout
6 Flashes
(Unable to Detect Flame)
Steady ON
Flame Control Failure
Enerco Group, Inc. | Kerosene Forced Air Heater
All manuals and user guides at all-guides.com
TROUBLE SHOOTING
1)
Make sure heater is cooled off, press reset switch and retry.
1)
Check wiring to motor (per wiring schematic in manual).
2)
Make sure that the gauge plug is in place and not damaged.
3)
Adjust pressure for proper heater operation per manual.
4)
With heater disconnected from AC source, rotate fan clockwise
to verify motor is free.
5)
Remove air filter housing from motor and inspect the pump rotor
for damage. If damaged, replace rotor assembly.
6)
If wiring is correct, pump rotor is okay, and motor is not rotating
freely, replace motor or power-pack assembly.
7)
If problem persists, replace oil flame control assembly.
8)
Check for spark arching from the electrode assembly (ref. 50), to the
combustion cylinder (ref. 39).
9)
Check the cad cell (ref. 38) for
10)
Check length and gage of extension cord for proper amp. draw.
1)
Check wiring to igniter (per wiring schematic in manual).
2)
Check gap between electrode probes (2.3 - 3 mm).
3)
Still no spark, replace igniter assembly.
4)
Replace oil flame control assembly.
1)
Motor speed too low (Motor should operate at 3450rpm) -
Replace motor.
2)
With heater disconnected from AC source, rotate fan clockwise
to verify motor is free.
3)
Remove air filter housing from motor and inspect the pump rotor
for damage. If damaged, replace rotor assembly.
4)
If wiring is correct, pump rotor is okay, and motor is not rotating
freely, replace motor or power-pack assembly.
5)
Replace oil flame control assembly.
1)
Check wiring to reset button.
2)
Replace reset button.
3)
Replace oil flame control assembly.
1)
Check wiring to Cad Cell (per wiring schematic in manual).
2)
Clean Cad Cell photo cell.
a)
Slide Cad Cell out of Cad Cell holder.
b)
Push the photo cell out of the white rubber Cad Cell housing
by pushing on the blue and white wires.
c)
Clean the photo cell with a soft cloth and rubbing alcohol.
d)
Pull the photo cell back into the Cad Cell housing and
reinstall into holder.
e)
Test heater.
3)
If the heater still does not operate, replace Cad Cell.
4)
Replace oil flame control assembly.
1)
Check wiring in heater (per wiring schematic in manual).
2)
Replace oil flame control assembly.
continuity.
7
Operating Instructions and Owner's Manual
04/06
70276
Rev. B
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