Problem / Cause / Correction - Viking VUWC244DRSS Service Manual

11.1 Problem / Cause / Correction, continued.
PROBLEM
Compartment temperature to cold, cont.
Compressor runs but does not cool.
Compressor excesively hot.
Frost buildup in divider
Frost build up on evaporator cover.
Neither compartment is maintaining its required
set-point.
Upper compartment is not satisfied and lower
compartment excessively cold.
2010 - Viking Preferred Service
POSSIBLE CAUSE
Heater / fan assembly not enabling
Return air damper not opening.
Thermistor out of range.
Broken or loose connection on communicaton
cable, U/I board, or main power board
Low on charge.
Restriction
Condensor fan motor not working.
Condensor fan blade not turning.
Dirty condensor.
Restricted air flow.
Compressor tripping.
Older version of software is installed. Evaporator
is not clearing during defrost.
No air flow.
Condensation has built up and frozen.
Plugged evaporator drain.
Older version of software is installed. Evaporator
is not clearing during defrost.
Possibly the compartment fans are mis-wired.
Top fan to bottom harness and visa versa. (Par-
ticularly if previously serviced).
Divider seal on door is by-passing air.
Upper compartment fan not working.
62
CORRECTION
Faulty main power board-replace.
Air leak - check to make sure divider is properly
installed.
Ohm and replace if necessary.
Check cable connections at U/I board and main
power board
Check continuity from one end of the commu-
nication cable harness to the opposite end - 0L
reading means a broken harness - replace
A close visual inspection of all terminal block
pins could reveal any broken connections
Repair and charge.
Repair and charge.
Replace condensor fan motor.
Look for restriction in fan shroud orifice.
Clean vacuum machine compartment.
Check for blocked or restricted air intake. Clean/
vacuum if needed.
Check continuity of overload & relay - replace if
necessary
Bad compressor - check for grounded or shorted
windings - replace compressor if necessary
Low voltage condition - Check incoming power
supply. This condition could cause an E2 error
Bad capacitor - replace
Install version 1.9 software.
Check for bad compartment fan.
Look for warm air leak at all tubing and wiring
portals.
Look for interior / exterior plug in evaporator
drain trough or drain line.
Install version 1.9 software.
Enter diagnostics mode and check compartment
fan operation (See section 4.1). Refer to sections
7.1.2, 7.1.2.1, & 7.1.2.2 if diagnostics shows that
fan operation is controlling opposite compart-
ment.
Inspect and replace door divider seal if needed.
Enter diagnostic mode and check compartment
fan operation (See section 4.1). Refer to Sections
7.1.2, 7.1.2.1, and 7.1.2.2 if diagnostics show fan
is not operating.
SMR-0005