Operating instructions

04/07 70276 Rev.C
7
Enerco Group, Inc. | Kerosene Forced Air Heater Operating Instructions and Owner’s Manual
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.
DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLE SHOOTING
LED CAUSE TROUBLE SHOOTING
1 Flash System Lockout 1) Make sure heater is cooled off, press reset switch and retry.
(High limit switch Open Circuit)
1) Check wiring to motor (per wiring schematic in manual).
2) Make sure that the gauge plug is in place and not damaged.
System Lockout 3) Adjust pressure for proper heater operation per manual.
2 Flashes (Sparks, calling for flame, but 4) With heater disconnected from AC source, rotate fan clockwise
no or slow motor operation) 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 continuity.
10) Check length and gage of extension cord for proper amp. draw.
1) Check wiring to igniter (per wiring schematic in manual).
3 Flashes System Lockout 2) Check gap between electrode probes (2.3 - 3 mm).
(No Spark) 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.
System Lockout 2) With heater disconnected from AC source, rotate fan clockwise
4 Flashes (Abnormal Motor Operation - to verify motor is free.
Motor overheats or Stops) 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.
5 Flashes System Lockout 1) Check wiring to reset button.
(Reset button Error) 2) Replace reset button.
3) Replace oil flame control assembly.
1) Check wiring to Cad Cell (per wiring schematic in manual).
System Lockout 2) Clean Cad Cell photo cell.
6 Flashes (Unable to Detect Flame) 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.
Steady ON Flame Control Failure 1) Check wiring in heater (per wiring schematic in manual).
2) Replace oil flame control assembly.