Mi-T-M HHB Series, Operator'S Manual

Page: 23 / 76

Operator's Manual 23
TROUBLESHOOTING
SYMPTOM PROBABLE CAUSE REMEDY
Water flows back into detergent Check valve in detergent strainer Remove, clean or replace.
container. missing or corroded.
Water flows from the nozzle when the Trigger gun is malfunctioning. Repair or replace.*
trigger gun is locked in the "OFF"
position.
Water is leaking under the unit. Safety Relief device is relieving 1. Detect and correct unloader or
caused by an unloader or pressure pressure switch problem.*
switch malfunction. 2. Replace safety relief device.
NEVER run unit without safety
relief device. Doing so can
cause an explosion!*
Burner will not ignite Switch is defective. Check switch position or replace.
Adjustable Thermostat is defective Check switch position or replace.
or in the "Off" position.
No voltage. Contact Customer Service.
Out of fuel. Refuel.
Fuel tank inlet tube screen obstructed. Remove, clean or replace tube.*
Trigger gun is closed. Open trigger gun for pressure.
Pressure switch override. Pressure should be over 250 PSI/
15 Bar to allow burner to come on.
(Pressure should be checked by an
authorized service technician.)
Fuel pickup screen is obstructed. Contact Customer Service.
Temperature above thermostat Unit will automatically reignite when
setting. cool.
High limit switch override. Unit will automatically reignite when
cool.
Flexible coupler broken. Replace.*
Dirty or clogged fuel filter. Drain or replace as necessary.*
Fuel pump sucking air. Tighten all fuel intake connections.
Eliminate leaks in intake line.
Fuel pump inoperative. Check pressure, replace if needed.
(Pressure should be checked by an
authorized service technician.)
Dirty or clogged fuel nozzle. Replace.*
Improper burner air adjustment. Adjust as explained on page 20.
Ignition transformer failure. Replace.*
Ignition electrodes not set properly, Contact Customer Service.
damaged or worn.
Fuel solenoid valve failure. Replace.*
High PSI mode. Verify burner switch is in the
"ON" position.
*See separate Parts List for detailed views or explanations.