16
P/N 1010751 Rev. G 01/08
McDonald’s
Multi-purpose steaMer - Mps-250
trouBleshootiNG
CautioN
To avoid possible personal injury and/or damage to the unit, inspection, test and repair of electrical equip
-
ment should be performed by qualified service personnel. The unit should be unplugged when servicing,
except when electrical tests are required.
Problem
Possible Cause
Corrective action
Unit is turned on but the
Switch Indicator Light is still
off and the Control Panel is
blank.
The unit is not correctly plugged in.
Plug unit in correctly.
The power cord and/or electrical
plug is damaged.
Inspect electrical wire, plug, and receptacle.
The main electrical panel circuit
breaker is off or has been tripped.
Reset circuit breaker. Contact your mainte-
nance person or Authorized Service Agency
if it trips again.
Switch is inoperable.
Contact your maintenance person or
Authorized Service Agency for service.
The unit’s main electrical
panel circuit breaker trips.
Damaged receptacle, plug, or cord;
a loose connection or an internal
component failure.
Turn the power off, allow it to cool to room
temperature, and then restart the unit.
The unit and Indicator Light
are on, but the display is
blank.
Hi-Limit Control shut unit off.
Hi-Limit Control Failure.
Transformer failure.
Contact your maintenance person or
Authorized Service Agency for service.
Unit is turned on, the Switch
Indicator light is on, the con-
trol panel display is on, but
the unit is not heating up.
Heat Relay is inoperable.
Contact your maintenance person or
Authorized Service Agency for service.
Thermocouple is inoperable.
Control Board is inoperable.
Heating element is inoperable
Unit heats up, the control
panel is on, but there is little
or no steam produced
and/or
The unit steams, but is not
producing the desired results.
The Quick Disconnect water line is
not corrected properly (or is
restricted).
Disconnect the Quick Disconnect fitting and
press its center piece in, over a container,
to check the water supply flow and pres-
sure.
Main water supply valve is turned
off.
Verify that the main water line valve is open.
Water pressure to the building and/
or to the unit is very low.
The water pressure regulator should be set
at 20-35 psi or 138 to 207 kPa.
Main water supply filter is plugged.
Clean or replace water line filter/strainer.
Programming is incorrect.
Check program and review the
Programming section of this manual.
Setpoint temperature maybe be too
low.
Temperature range is 375°–425°F (191°–
218°C).
Diffuser may not be installed.
Install Diffuser.
Programming may need to be
changed.
Refer to the Programming section within
this manual.
Generator surface needs cleaning.
Follow this manual’s cleaning instructions.
Generator surface is too clean.
Add ordinary tap water to the Generator
surface and allow it to boil off, or follow the
“seasoning” instructions in the Maintenance
section of this manual.
