Posts
All the articles I've posted.
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Champion UH130 Error Code — Fill Cycle Fault Fix
A Champion UH130 fill-cycle fault means the wash tank didn't reach proper water level in the timeout window — typically a clogged fill valve inlet screen, a...
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Copeland Discus Compressor Trip Codes — CoreSense Diagnostic Reference
Copeland Discus compressors equipped with CoreSense protection trip on internally-monitored faults — high discharge temperature, motor protection trip, low...
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Cornelius Ice Machine Error Code — IMI / Cornelius Fault Diagnosis
Cornelius (formerly IMI Cornelius, now part of Marmon Foodservice Technologies) ice machines show E-series fault codes (E01 through E12 typically) when the...
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Daikin A6 Error Code — Indoor Fan Motor Fix
Daikin A6 means the indoor PCB commanded the indoor blower motor to a target RPM and didn't see the feedback tach signal come back where it expected — the...
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Daikin C4 Error Code — Indoor Heat Exchanger Thermistor Fix
Daikin C4 means the indoor heat-exchanger thermistor (R2T or the equivalent coil sensor depending on platform) reads open, shorted, or out of the expected...
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Daikin L5 Error Code — Compressor Lock Fix
Daikin L5 means the outdoor inverter detected an instantaneous overcurrent on the IPM (intelligent power module) output to the compressor — the inverter saw...
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Daikin U4 Error Code — Indoor-Outdoor Communication Fix
Daikin U4 means the indoor head and the outdoor condenser stopped talking on the F1/F2 communication bus. Nine times out of ten it's a wiring problem — a...
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Daikin UA Error Code — Mismatched Indoor/Outdoor Unit Fix
Daikin UA means the indoor PCB and the outdoor PCB compared model IDs over the F1/F2 link and decided they aren't a compatible pair. It's almost always a...
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Danfoss FC-302 Alarm 12 — Overcurrent Fix
Danfoss FC-302 Alarm 12 (Torque Limit) means the drive's output current has been at the torque-limit setting (parameter 4-16 Motor Mode Torque Limit,...
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Danfoss FC-302 Alarm 13 — DC Link Overvoltage Fix
Danfoss FC-302 Alarm 13 (Over Voltage) means the DC link voltage exceeded the trip threshold — approximately 820 VDC on a 380–500V drive (parameter 14-23...
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Doosan / DN Solutions Alarm 302 — APC Fix
Doosan (now DN Solutions, after the 2022 rebrand) alarm 302 on the Fanuc-controlled VMC, HMC, and Mynx machining centers indicates an APC (Automatic Pallet...
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Meiko / Ecolab Commercial Dishwasher Error Code Reference
Meiko dishwashers (also private-labeled under Ecolab in some North American foodservice accounts) use a standardized error code library across the M-iQ,...
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Electrolux Washer Error Code E20 — Drain Pump Fix
Electrolux washer error E20 (also displayed as "EF" on some models) means the control board energized the drain pump but didn't see the wash water drop to...
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Fanuc Alarm 430 — Servo Motor Overheat Fix
Fanuc Alarm 430 (Servo Motor Overheat, with axis name) means the thermistor inside the named servo motor's stator winding exceeded the trip threshold —...
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Fanuc vs Mazak CNC Controls — A Machinist's Honest Comparison (2026)
If your shop runs job-shop work with frequent program changes, varied materials, and operators with mixed experience levels, buy a Mazak — the SMOOTH...
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Frigidaire Dishwasher Error Code i30 — Water in Base Fix
Frigidaire dishwasher error i30 (also displayed as "30" or "iE30" on some models) means the anti-flood float switch at the bottom of the base pan has...
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Frigidaire Refrigerator Error Code SY EF — Evap Fan Fix
Frigidaire (and its parent Electrolux's appliances under the Frigidaire badge) display error "SY EF" when the main control board detects that the freezer...
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Fujitsu Mini Split 11:4 Error Code — Indoor Unit Communication Timeout Fix
Fujitsu 11:4 means the outdoor PCB stopped receiving valid communication frames from the indoor unit within the firmware timeout. It's almost always wiring...
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Fujitsu Mini Split 14:1 Error Code — High Pressure Fix
Fujitsu 14:1 means the outdoor high-pressure switch opened — head pressure climbed past the trip point (around 580-620 PSI on R-410A platforms) and the...
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Fujitsu Mini Split 15:1 Error Code — Low Pressure Fix
Fujitsu 15:1 means the suction-side low-pressure switch opened — suction pressure dropped below the trip threshold (around 25-30 PSI on R-410A platforms)...
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Garland Char-Broiler Error Code — Safety Lockout Fix
Garland commercial char-broilers display "SAFE" or "PILOT" lockout (on electronic-ignition models) or simply fail to light (on standing-pilot models) when...
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GE Dishwasher Error Code LC — Leak Detected Fix
GE dishwasher error LC means the leak-detection sensor at the bottom of the cabinet (a small float switch in the base pan or, on newer Profile models, a...
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GE Refrigerator Error Code Er — Diagnostic Guide
GE Profile, Cafe, and Monogram refrigerators show "Er" on the dispenser display when the main board has lost communication with one of its sensor inputs —...
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GE Washer Error Code E1 — Front-Load Inlet Fix
GE front-load washer error E1 (sometimes paired with E2 on some models) means the control board started a fill cycle but didn't see the tub reach target...