Viking DFUW244CL, Service Manual

Page: 67 / 87

62
PROBLEM POSSIBLE CAUSE CORRECTION
Compartment temperature to cold, cont. 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
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
Compressor runs but does not cool. Low on charge.
Restriction Repair and charge.
Repair and charge.
Compressor excesively hot. Condensor fan motor not working.
Condensor fan blade not turning.
Dirty condensor.
Restricted air flow.
Compressor tripping.
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
Frost buildup in divider Older version of software is installed. Evaporator
is not clearing during defrost.
No air flow.
Condensation has built up and frozen.
Plugged evaporator drain.
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.
Frost build up on evaporator cover. Older version of software is installed. Evaporator
is not clearing during defrost. Install version 1.9 software.
Neither compartment is maintaining its required
set-point.
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.
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.
Upper compartment is not satisfied and lower
compartment excessively cold.
Upper compartment fan not working. 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.
11.1 Problem / Cause / Correction, continued.
2010 - Viking Preferred Service SMR-0005