Posts
All the articles I've posted.
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Mitsubishi P7 Error Code — System Mode Mismatch Fix
A Mitsubishi P7 means one or more indoor units in a multi-zone or VRF (variable refrigerant flow) system has requested a mode (heating or cooling) that...
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Mitsubishi vs Daikin Mini-Splits — A Service Tech's Honest Comparison (2026)
If you want the highest-performance cold-climate mini-split for a Northern U.S. home (Hyper-Heat technology for sub-zero performance), buy Mitsubishi — the...
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Mori Seiki / DMG MORI Alarm 3010 — Servo Error Fix
Mori Seiki / DMG MORI Alarm 3010 (sometimes formatted as "SV-3010" or "Servo Alarm 3010" in the OPERATOR screen) is a Fanuc servo amplifier error indicating...
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Navien NPE/NCB Code E003 — Ignition Failure Fix
E003 on a Navien NPE-A, NPE-S, NCB, or NFC series condensing combi/boiler indicates an ignition failure — the control attempted ignition through its full...
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Navien NPE-A 016 — Overheat Lockout Fix
Code 016 (also displayed as E016) on a Navien NPE-A or NPE-S tankless water heater means the unit's heat exchanger outlet temperature exceeded the overheat...
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Norlake Walk-In Error Code — Defrost Issue Fix
Norlake commercial walk-in cooler and freezer controllers (typically Heatcraft Beacon II or KE2 Evap Efficiency in newer installs, Danfoss EKC in older)...
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Okuma OSP Alarm 2202 — Spindle Fix
Okuma OSP control alarm 2202 (formatted as "2202 SPINDLE" or "2202-1" with axis sub-code) indicates the spindle drive amplifier has detected a fault during...
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Payne Error Code 31 — Pressure Switch Did Not Open Fix
Payne code 31 means the integrated furnace control sees the pressure switch already closed at the start of a heat call, before the inducer has run — the...
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Pitco Fryer Error Code E6 — High Temp Limit Fix
Pitco commercial fryer error E6 means the high-limit safety switch has opened — oil temperature exceeded the safety threshold (typically 460-475°F). The...
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Allen-Bradley PowerFlex vs Siemens SINAMICS — An Industrial Tech's Honest Comparison (2026)
For a plant that's already standardized on Rockwell ControlLogix or CompactLogix PLCs and uses EtherNet/IP as its primary fieldbus, buy Allen-Bradley...
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Samsung vs LG French-Door Refrigerators — An Appliance Tech's Honest Comparison (2026)
If you want a feature-rich French-door refrigerator with the most-developed smart-home integration and a generally lower service-call rate over 5-8 years,...
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Schneider Altivar OCF Fault — Overcurrent Fix
Schneider Altivar OCF (Overcurrent Fault) on the ATV320, ATV340, ATV630, ATV930, and most legacy ATV61/71 drives means the drive's IGBT power module...
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Schneider Altivar OSF Fault — Overspeed Fix
Schneider Altivar OSF (Overspeed Fault) means the drive's speed feedback (calculated from the back-EMF model in open-loop or from a real encoder in...
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Scotsman 6-Flash Code — Refrigerant Pressure Out of Range Fix
A 6-flash code on a Scotsman Brilliance-series ice machine means the controller has detected refrigerant pressure outside the expected operating range —...
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Siemens SINAMICS G120 F30011 Fault — Phase Loss Fix
SINAMICS G120 F30011 (Line Phase Loss) means the Power Module's input phase-monitoring logic detected that one of the three input phases is missing or...
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Siemens SINAMICS G120 F30021 Fault — Ground Fault Fix
SINAMICS G120 F30021 (Ground Fault) means the Power Module's output current sensors saw an imbalance — current flowing out the U, V, W phases summed to a...
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Sub-Zero Refrigerator Error Code EC — Evap Fan Fix
Sub-Zero refrigerators display "EC" (sometimes shown as "EC 38" or "EC 39" with sub-code) when the main control board detects an evaporator fan circuit...
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Takagi Code 111 — No Ignition Fix
Code 111 on a Takagi tankless water heater (T-H3, T-H3J, T-K4, T-D2, T-KJr2, T-M50, and the newer Tx2 condensing platforms) means the unit attempted...
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Tempstar 4-Flash Error Code — Limit Switch Fix
A Tempstar 4-flash code means the integrated furnace control opened the gas valve on a heat call, but a high-limit safety switch (either the primary heat...
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Trane 3-Blink Error Code — Pressure Switch Fault Fix
A 3-blink fault on a Trane furnace LED means the integrated furnace control did not see the pressure switch close after the inducer started, or...
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Trane XV20i/XV18 Fault 126 — Low Pressure Cutout Fix
Fault 126 on a Trane XV20i, XV18, or XL20i variable-speed heat pump means the outdoor unit's low-pressure switch opened — refrigerant suction pressure...
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Trane Voyager RTU Error Code 31 — Fix
Trane Voyager rooftop unit (RTU) error code 31 on the UCM (Unit Control Module) or Tracer SC controller indicates a high-pressure cutout — the...
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Viking Range Error Code F0 — Control Board Fault Fix
Viking range error F0 (sometimes shown as "F-0" or just blinking "F" on older models) indicates the electronic oven control (EOC) has detected an internal...
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Vulcan/Wolf Convection Oven F-Code Error — Gas Oven Fix
Vulcan and Wolf (commercial Wolf, not residential Sub-Zero Wolf) gas convection ovens display F-series error codes (F1 through F9 depending on model) when...