Milnor MilTouch - Page 93

Pellerin Milnor Corporation 91
• If the temperature achieved rises, but not to the temperature desired, you suspect that a
problem external to the machine prevents sufficiently hot water from reaching the ma-
chine (see note below). Some possible causes are a clogged water filter in the hot water
line, a shutoff valve in the hot water line not fully open, water heater temperature not ad-
justed hotter for winter conditions, water line break, a temporary increase in hot water de-
mand by other devices.
NOTE: If you observe the actual temperature rise, but not fast enough to reach the
desired temperature in time, this can also be because an inefficient method was used
to program modulation of the hot and cold water valves (see Section 3.4 : How to
Modulate Water Valves to Regulate Incoming Water Temperature, page 40).
2. You suspect that the hot water valve is not functional. With the machine idle, you use the Di-
agnostics display with Outputs (Section 4.7.1.2 : Digital Outputs, page 68) selected to view
or actuate outputs. You actuate the Hot Water output (output O-8) and observe that the hot
water valve does not open.
3. With the output actuated, you observe the corresponding light on the Input/Output (I/O) board
(Section 4.8.1 : Status Lights on Boards, page 71).
• If the Output O-8 status light is illuminated, both the status light and the display show that
the output is actuated (the light agrees with the information on the display). You suspect
an open in the wiring between the I/O board and the electrically operated hot water valve
or a faulty valve. Refer to the electrical schematic manual for your machine to trouble-
shoot the hot water valve circuit. The schematic manual identifies connection points, wire
numbers, and electrical component part numbers.
• If the status light is illuminated, the light does not agree with the information on the dis-
play. This should never occur. Consult Milnor
®
Customer Service/Technical Support us-
ing the contact information in Section 6.4 : How to Contact Milnor
®
, page 117 to further
troubleshoot the controller.
Troubleshooting