OP is a diagnostic reading. On thermistor tests it means the sensor circuit is open.
Model compatibility: Viking reuses codes across series and model years, so OP may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
In service test mode, OP on thermistor tests 141, 142, 144 and 145 means the thermistor reads open.
If OP is on the display of a Viking VCFF or DDFF136D, service test mode is almost certainly active. The technician diagnostics sheet documents it, and normal running never produces it.
Meaning by test
Test
OP indicates
141 (fresh food thermistor)
Thermistor open
142 (freezer thermistor)
Thermistor open
144 (ambient thermistor)
Thermistor open
145 (ice box thermistor)
Thermistor open
Door state tests
Door open, which is normal
101 (defrost)
Defrost circuit powered with the defrost thermostat open
Thermistor tests usually print a temperature. An open thermistor puts OP there instead, and a shorted one puts SH.
Getting in and out
Press and hold WATER.
Press and hold UR, then let go of WATER and wait 3 seconds.
SE appears. Press UR again to confirm, and test 101 is shown.
To exit, cycle the fridge door open and shut, or keep the door alarm pressed 3 seconds.
For the owner
No owner repair is given. A thermistor senses temperature, and when it is open it cannot report. If you ended up here by accident, leave the mode. For a cabinet that is running warm or cold, pass on the test number showing OP.
Related
SH is the shorted reading on the same thermistor tests.
oPn is a separate sensor alarm on built-in models.
French door refrigerator repair in Los Angeles
To have a thermistor looked at on a Viking in Los Angeles, call (310) 692-1112 and quote the test number that gave OP. More under refrigerator repair.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Viking appliance?
Book a specialist visit for a clear estimate and approval before any repair.
