CoolTIG220 Parts Substitution Card

This is the quick external-parts substitution card for the highest-value CoolTIG220 torch, gas, and control-accessory splits.

Use This Card When

there is no TIG start but the machine is not clearly dead
the complaint may follow one remote or switch branch only
shielding-flow behavior still looks suspicious
the machine may simply be on the wrong HF versus no-HF expectation

Stage First

known-good TIG torch and front-end consumables
known-good gas regulator and hose path
known-good work clamp and lead set
known-good pedal or switch branch only if the complaint involves it
simplest DC TIG baseline restored before AC, pulse-like, or remote-heavy testing
local control proven before blaming a switch or pedal branch

Fast Substitution Card

Complaint branch	Swap first	If the complaint follows the part...	If the complaint stays with the machine...
no TIG start with otherwise normal idle state	known-good torch and front-end consumables after restoring the simplest DC TIG baseline	keep diagnosis in the torch branch	move to version and control-state logic
unstable or leaking shielding flow	known-good regulator and hose path	keep diagnosis in the gas branch	move deeper only if shielding is proven
complaint follows one control branch	known-good switch or pedal branch after local control is proven	keep diagnosis external	stop before board blame
TIG dead while stick stays healthy	keep external parts fixed and compare process branches	keep diagnosis in TIG-only logic	move deeper only after the external path is clean

Official Ordering Shortcuts

CoolTIG220 parts category: official parts path
PRO17 TIG torch WAT31100: official product page
FC25-HD foot pedal 07002510: official product page

Stop Rules

Stop if the complaint follows one control branch only.
Stop if gas correction restores the machine.
Stop if the fitted unit matches the documented no-HF version note and the supposed HF fault disappears under the correct expectation.
Stop if simple DC TIG is healthy and only one switch or pedal branch still fails.
Stop using the card and open the full guide if torch, gas, and version branches are already proven clean.

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