Mosebach bk10l Troubleshooting Manual

Thermostat/Heater will not turn on

-Make sure the master 120v receptacle is
powered.

-Ensure Main Power switch is in the ON
position.

Blower will not turn on

-Check for debris preventing fan from turning.

-Check control fuse (FC).

Load steps will not turn on

-Check if over temperature or tip over light is on.

-Check over temperature sensor (OTS) is
working.

-Check control fuse (FC).

-Check that the heater is not tipped further than
45°.

-Visually inspect resistors for damage.

-Check resistor step fuses (F1-F6).

-Check the temperature set point (should be at
140°F).

-Check the ‘Ready’ light is on.

Which of the 120v extension cords must be
plugged in for use?

-The master/control power 120v extension cord
must be plugged in.

What size power cord is needed?

-#14AWG for 120v for up to 50 feet.

-#12AWG for 120v for past 50 feet.

How long does treatment take?

-This will depend on the type of the bug and the
size of the room. Please refer to the Time in
Minutes to Mortality Chart for temperature and
minutes in the Owner’s Manual.

Room is not getting hot enough

-Check the size of the area (refer to Owner’s
Manual).

-Check the voltage levels in the building.

-Add insulation to windows, vents, and doors.

-Add an external air mover.

Room is heating unevenly

-Add an external air mover.

Breakers are tripping

-Check each outlet used is not on the same
circuit. The 120VAC main plug ha an amp draw
of 15A and the 120VAC coil plugs have an amp
draw of 13A. Having 2 plugs on the same circuit
can cause an overdraw resulting in a tripped
breaker.

Troubleshooting Guide

For BK10L

Revision Number: 2 Page 1 of 2
Control Date: 4.7.17

Clicking sound

-Check for low voltage.

-This can also be the sound of the contactors
closing and opening. This is a regular function
for the thermostat to regulate the heat output.

Can’t go past 140°F maximum temperature

-Thermostat is preset to 140°F max limit.

Some coils are glowing red/orange

-This is a normal function of the heater elements.
Not all coils will glow.

What is the preset temperature for the
thermostat?

-The preset value for the thermostat is 140°F.

Ready light is not on

-Ensure Main Power switch is in the ON
position.

-Check the master 120v receptacle is powered.

-Check power to light.

-Check if over temperature or tip over light is on.

Can’t access thermostat parameter settings

-These parameters are preset by Mosebach at the
factory and are not meant to be changed aside
from the temperature set point.

The over temperature light is on

-Check for any obstructions of airflow.

-Check that the fan is running.

The tip over light is on

-Check that the heater is not tilted more than 45°
on any side.

Revision Number: 2 Page 2 of 2
Control Date: 4.7.17