This landing page pulls the WeldKing guides into one service-facing brand map so technicians can navigate by family, not just by category folder.
The guides in this brand set were built from:
assets/reference_doc/WeldKingassets/reference_doc/all_models/troubleshoot_notes.xlsxSymptom-to-reference lookup section first.| Model | Guide | Notes |
|---|---|---|
| CoolArc160 | guide | strongest local board-split notes for low OCV, auxiliary 24 V, and fan revision behavior |
| CoolArc200 | guide | input-sense branch, VRD versus non-VRD low OCV, and fan-related false faults |
| Model | Guide | Notes |
|---|---|---|
| MAG211 | guide | solenoid behavior, chart-correct baseline, and Bernard or spool-gun false-fault branch |
| MAG251 | guide | 36 VAC solenoid, capacitor ripple, and post-board-change motor-direction issues |
| MAG255 | guide | crater-fill, spool-gun pins 1 and 9, and capacitor-discharge behavior |
| MigSonic145 | guide | capacitor-board support path, torch generation split, and trigger-wire branch |
| MigSonic252S+SS20 | guide | remote-feeder architecture with controls living in the power source |
| Model | Guide | Notes |
|---|---|---|
| MigSonic200 CVCC | guide | CV/CC shared-power diagnosis with trigger-wire and rectifier split |
| MultiSonic220 | guide | debug mode, one-process-still-healthy splits, ribbon/control issues, and polarity-connector false faults |
| Model | Guide | Notes |
|---|---|---|
| CoolTIG220 | guide | HF-versus-no-HF version split, gas or remote branch, and calibration-sensitive package state |
| PulseWave200 | guide | reset-state, torch-negative HF rule, gas-flow-sensitive no-HF branch, and AC-versus-DC split |
| TIG200PACDC | guide | simpler AC/DC TIG with foot-control and display-expectation notes |
| Model | Guide | Notes |
|---|---|---|
| CoolCut30 | guide | capacitor-board versus top-board split and HF gap baseline |
| CoolCut40air | guide | internal-versus-external air split, dual-valve routing, and SG55 wear path |
| CUT40 | guide | external-air SG55 platform with valve and hose contamination branch |
| CUT65 | guide | pilot-maintain-current and torch-head rebound family logic |
| ThunderCut65 | guide | strongest family notes for postflow-with-no-start, pressure-window or RV1, and torch-head or guide-hardware branch |
These machines repeatedly show support-power faults before main-output faults:
CoolArc160CoolCut30MigSonic145What usually happens:
CoolArc160 can look like an inverter failure when the fan auxiliary path or revision-specific fan wiring is actually the first faultOpen first:
These machines can look faulty when they are actually in the wrong state or input interpretation:
CoolArc200PulseWave200MultiSonic220What usually happens:
CoolArc200 can be healthy while VRD or post-start low OCV is being misread as a dead output stagePulseWave200 can be healthy when torch polarity, gas flow, or reset-state is wrongMultiSonic220 can be healthy when debug mode, polarity connector, or one accessory branch is wrongOpen first:
These models are often misdiagnosed because the fitted package changes the real complaint path:
CoolCut40airCUT40CUT65ThunderCut65CoolTIG220PulseWave200What usually happens:
CoolTIG220 can look dead when the wrong HF-versus-no-HF version assumption, gas path, or remote branch is actually the problemCoolCut40air can stay in the valve-routing or internal-air branch long before the output board is implicatedThunderCut65 can stay in pressure-window, torch-head rebound, or guide-hardware branches before any board call is justifiedThe MAG family shares recurring shop-service patterns:
MAG2511 and 9 plus discharge-path proof on MAG255Open first:
| If the complaint is... | Start with... | Why |
|---|---|---|
| fan oddities, low OCV, or arc dies after a short run | CoolArc160, CoolCut30, or MigSonic145 family guides |
that family repeatedly uses support-power and capacitor-board splits |
| wrong input display or low OCV that may be normal state behavior | CoolArc200 | strongest input-detect, J3 sense, and VRD branch logic in the brand |
| MIG dead but stick and TIG still work | MultiSonic220 | clearest debug-mode, polarity-connector, feeder-idle, and ribbon/control branch |
| compact MIG clicks on and off, trigger stays dead, or full-speed feed follows a support-power event | MigSonic145 | strongest 24 V, trigger-wire, gun-generation, and tip-removed base-gun proof in the non-core MIG tier |
| source readouts freeze, gas stays open, or the feeder is blamed while the source already looks wrong | MigSonic252S+SS20 | clearest source-versus-feeder split because the power source must prove healthy readouts, jog or purge behavior, and idle gas before feeder blame |
| TIG panel is strange or HF seems dead after an arc event | PulseWave200 | strongest reset-state, torch-negative, gas-flow, and AC-versus-DC split |
| no HF on a 220 V TIG, or TIG acts wrong after service | CoolTIG220 | strongest HF-versus-no-HF version split plus gas, torch, and remote branch logic |
| AC TIG is unstable while DC TIG is healthy, or only one pedal branch misbehaves | TIG200PACDC | strongest simple-DC-first, local-control-first, and 4K7 remote-branch logic in the compact AC/DC TIG tier |
| built-in-air behavior is wrong, both air paths move together, or moisture-sensitive no-start stays mode-specific | CoolCut40air | strongest internal-versus-external air-mode and dual-valve logic in the plasma tier |
| external-air no-start, bad hose or valve routing, or guide-hardware complaints on a CB50 plasma | CUT40 | clearest CB50 torch, hose-routing, and freehand-first-versus-guide-hardware logic |
| pressure-sensitive pilot, postflow with no start, or torch-head trouble on the compact 65 A family | CUT65 | strongest pressure-window, RV1, torch-head, and freehand-versus-A81-hardware logic on the compact 65 A path |
| delayed restrike, pilot-maintain-current drift, or guide-carriage trouble on the ThunderCut 65 family | ThunderCut65 | strongest pressure-window, RV1, torch-head rebound, and guide-hardware logic on the ThunderCut 65 path |
| chart-sensitive rough arc, no gas command, or one-gun-only failure on a compact MAG | MAG211 | strongest chart-baseline, solenoid, and spool-gun branch notes for the entry MAG family |
| rough arc with ripple feel or wrong feed direction after board work | MAG251 | strongest ripple and post-service motor-direction notes in the MAG family |
| wire creep after stop, sparks at the wire tip without trigger, or spool-gun mode will not weld | MAG255 | strongest crater-fill, discharge-path, and spool-gun-voltage notes in the MAG family |
CoolArc160 current path or TIG kit: parts category, TIG kit 07003650, ground clamp 07000461, holder 07000460CoolArc200 adapter, return path, or TIG kit: parts category, TIG kit 07003750, adapter 07001825, ground clamp 07000462MultiSonic220 torch, spool gun, pedal, or aluminum-kit branch: parts category, aluminum kit XOM99035, spool gun 07NS1010, PRO17 torch WAT31100, pedal 07002510PulseWave200 torch or pedal branch: parts category, PRO17 torch WAT31100, FC25-HD 07002510, FC25-WL 07002515MAG211 spool-gun and drive-roll branch: parts category, SpoolKing24D 07NS1000, U-groove drive roll 07000302MAG251 spool-gun and drive-roll branch: parts category, SpoolKing24D 07NS1000, drive-roll familyMAG255 spool-gun, discharge, and drive-roll branch: parts category, SpoolKing24D 07NS1000, U-groove drive roll 07000302CoolTIG220 torch or pedal branch: parts category, PRO17 torch WAT31100, FC25-HD 07002510TIG200PACDC gas or remote branch: parts category, gas regulator branch 07000510, gas hose branch 072611120MigSonic145 gun, spool-gun, or gas-side branch: parts category, NT-1 gun 07000422, SpoolKing-200 07NS2000, gas-side branchMigSonic252S+SS20 spool-gun and feeder-package branch: parts category, SpoolKing24D 07NS1000, drive roll 07NS1007CoolCut40air SG55 consumable branch: parts category, SG55 electrode 07Y2517003, SG55 nozzle 07Y2517004, shared SG55 tip path 07Y2517005CUT40 torch and guide-hardware branch: parts category, CB50 torch 07001710, guide carriage 07CV0037, extended tip 07PD0063-10CUT65 torch and pressure-sensitive branch: parts category, A81 torch 07001400, 2-leg stand-off 07CV0026, circle kit 07CV0052ThunderCut65 torch and guide-hardware branch: parts category, A81 torch path, guide carriage 07CV0051, stand-off guide 07CV0028MAG211 repair path: measurement card, job packet, parts card, board opening map, fault workflow routerMAG251 repair path: measurement card, job packet, parts card, board opening map, fault workflow routerMAG255 repair path: measurement card, job packet, parts card, board opening map, fault workflow routerMultiSonic220 repair path: measurement card, job packet, board opening map, fault workflow routerPulseWave200 repair path: measurement card, job packet, board opening map, fault workflow routerMigSonic145 repair path: measurement card, job packet, board opening map, fault workflow routerMigSonic252S+SS20 repair path: measurement card, job packet, board opening map, fault workflow routerTIG200PACDC repair path: measurement card, job packet, board opening map, fault workflow routerCoolCut40air repair path: measurement card, job packet, board opening map, fault workflow routerCUT40 repair path: measurement card, job packet, board opening map, fault workflow routerCUT65 repair path: measurement card, job packet, board opening map, fault workflow routerThunderCut65 repair path: measurement card, job packet, board opening map, fault workflow routerassets/reference_doc/all_models/troubleshoot_notes.xlsxCoolArc160, CoolArc200, MultiSonic220, and PulseWave200 all surface fan or auxiliary-supply, input-sense, debug/reset-state, process-split, and torch or remote false-fault logic before teardown.CoolTIG220 surfaces version, gas, and remote splits early; and CoolCut40air plus ThunderCut65 surface air-mode, pressure-window, and guide-hardware branches before teardown.MAG211, MAG251, and MAG255, so technicians can stay on the exact model instead of falling back to a shared MAG placeholder.MigSonic145, MigSonic252S+SS20, TIG200PACDC, CUT40, and CUT65 all surface their own intake and fast-track paths instead of hiding behind generic family language.