Written by
Hannah Ostrowski Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeOP
ApplianceRefrigerator
Which refrigerators show OP
The code is documented in two Frigidaire service data sheets for bottom-freezer ice and water refrigerators: 242321500 for the FFHN2740PS/PE and A01544701 for the FGHG2366PF. OP stands for an open thermistor, and the spot where it lights up, FF or FZ, tells you whether the fresh-food thermistor or the freezer thermistor is affected.
Owner or technician?
Neither sheet provides a reset or check for the owner, so OP is handled as service work.
A technician starts System Diagnostic Mode, where each thermistor test reports OP for an open sensor and SH for a shorted one.
The temperature on the display is then compared with a gauge placed at the thermistor.
Codes worth comparing
SH: the shorted counterpart of the same thermistor fault
H or HI: the compartments were too warm for over an hour
If your bottom-freezer refrigerator in San Francisco or elsewhere in the Bay Area displays OP, ask for Frigidaire refrigerator repair on (415) 319-6371. Say whether OP sits in the FF or FZ position and read out the model number.
Model compatibility: Frigidaire 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
OP reports an open fresh-food (FF) or freezer (FZ) thermistor on Frigidaire bottom-freezer ice and water refrigerators.
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 Frigidaire appliance?
Book a specialist visit for a clear estimate and approval before any repair.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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