Posts
All the articles I've posted.
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Allen-Bradley PowerFlex 755 Power Loss Fault Fix
PowerFlex 755 Power Loss Fault (F3 Power Loss, sometimes paired with F2 Aux Power Loss in the same event) means the drive detected loss of one or more input...
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Best Boiler Test Kit for Hydronic Technicians (2026) — Field-Tested Picks
A proper hydronic boiler test kit isn't a single product — it's four instruments that work together. Start with the Testo 320 combustion analyzer, the...
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Best Clamp Meter for Electricians (2026) — 3 Tested Picks
For industrial electricians, VFD techs, and commercial maintenance crews, the Fluke 376 FC is the clamp meter to buy — True RMS AC and DC current, 1000A...
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Best CNC Touch Probe (2026) — 3 Tested Picks for Setup and Inspection
For most shops running Haas, Mazak, DMG-MORI, or Okuma machining centers, the Renishaw OMP60 is the touch probe to buy — proven optical signal, ±1 µm...
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Best Combustion Analyzer for HVAC Techs (2026) — 4 Tested Picks
For most residential and light-commercial HVAC techs, the Testo 320 is the analyzer to buy — it has the sensor accuracy and durability to last 8+ years, the...
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Best Loop Calibrator for VFD and Instrumentation Techs (2026) — 3 Tested Picks
For most VFD techs and instrumentation electricians, the Fluke 715 Volt/mA Calibrator is the loop calibrator to buy — simple two-button interface, 0–24mA...
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Best Manometer for HVAC Technicians (2026) — 3 Tested Picks
For HVAC work, the Fieldpiece SDMN6 is the manometer that lives in my pouch — dual-port, reads in inches of water and PSI, wireless to Job Link, and...
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Best Multimeter for HVAC Technicians (2026) — 4 Tested Picks
If you're a residential HVAC tech buying one meter to live in your truck for the next decade, get the Fluke 117 — it has the True RMS, microamp DC range for...
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Best Megohmmeter for Electricians and VFD Techs (2026) — 3 Tested Picks
For motor winding insulation tests, VFD power and motor leads, and general industrial maintenance up to 600V class, the Fluke 1587 FC is the megohmmeter to...
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Best Refrigerant Gauge Set for HVAC/R Techs (2026) — 3 Tested Picks
For most refrigeration and HVAC techs in 2026, the Testo 550i is the digital gauge set to buy — it handles R-410A, R-454B, R-32, R-290, CO2 (R-744) and 30+...
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Best Refrigerant Leak Detector (2026) — 3 Tested Picks
For commercial refrigeration and HVAC service, the Fieldpiece DR82 is the leak detector to buy — heated diode sensor, sensitivity to 0.1 oz/year, and works...
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Best Thermal Imager for HVAC Technicians (2026) — 3 Tested Picks
For most HVAC field techs, the Seek ShotPRO is the thermal imager to buy — 320×240 resolution, real shutter calibration, and standalone operation (no phone...
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Best Vacuum Pump for Refrigeration Techs (2026) — 3 Tested Picks
For most refrigeration and HVAC techs, the JB Industries DV-285N Platinum is the vacuum pump to buy — 10 CFM two-stage, pulls reliably to 25 microns, and...
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Bryant Evolution Code 13 — Limit Lockout Fix
Bryant Evolution code 13 is a limit lockout — the integrated furnace control opened the gas valve repeatedly on consecutive heat calls because a limit...
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Bryant Evolution Code 21 — Gas Heating Lockout Fix
Bryant Evolution code 21 is a gas heating lockout — the integrated furnace control attempted ignition three times in a row, failed to prove flame each time,...
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Bryant Evolution Heat Pump 21 — Defrost Sensor Fix
Code 21 on a Bryant Evolution heat pump (286BNV, 280ANV, 226ANV, 25HNB6 platforms paired with the Evolution Connex thermostat or SYSTXBBECC controller)...
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Burnham/U.S. Boiler Fault Code 2 — Ignition Lockout Fix
Fault Code 2 on a Burnham (now U.S. Boiler Company) 7-Series, 8-Series, ESC2, or Alpine gas-fired boiler indicates an ignition lockout — the integrated...
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Carrier Greenspeed A3 — Defrost Fault Fix
Code A3 on a Carrier Greenspeed Infinity heat pump (25VNA0, 25VNA4, 38MGRQ, 38MURA platforms) indicates a defrost fault — the variable-speed inverter and...
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Carrier WeatherMaker RTU Error Code 23 — Fix
Carrier WeatherMaker rooftop unit (RTU) error code 23 on the Comfortlink II or i-Vu control system means the unit's compressor circuit has locked out due to...
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Carrier vs Trane Furnaces — A Service Tech's Honest Comparison (2026)
If you want the furnace that's easier and cheaper to service over a 15-20 year lifespan, buy Carrier (or its Bryant/Payne siblings — same boards, same...
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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...