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Fireye MicroM Flame Safeguard (MC-5000)

Fireye MicroM Flame Safeguard (MC-5000) code 22: Lockout Intrlck Closed

The interlock switch was detected as closed when it was expected open, preventing burner startup.

Safety first. This code involves a burner or safety lockout. Do not keep resetting it. Leave burner, gas train and high voltage work to a qualified technician. WERCS answers 24/7 at (877) 489-3727.
Code
22
Name
Lockout Intrlck Closed
Controller
Fireye MicroM Flame Safeguard (MC-5000)
Type
Safety interlock
What it does
Lockout: the control shuts down and stays off until it is reset
Risk
RED Specialist territory
Reset
Needs a manual reset
Source
The manufacturer's manual (subscribers see which manual and page)

Updated November 4, 2026

How to fix it

Subscribers get:

  • What to do next, in plain words
  • Which manufacturer manual it comes from, linked
  • The step by step check for this problem, one check at a time
  • Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Unlock the fix · plans from $49/moCall 24/7 (877) 489-3727

Questions about this code

What does Fireye MicroM Flame Safeguard (MC-5000) code 22 mean?

The interlock switch was detected as closed when it was expected open, preventing burner startup.

Is Fireye MicroM Flame Safeguard (MC-5000) code 22 dangerous?

It is graded red, specialist territory: it involves a burner, gas, flame or safety lockout, so leave the repair to a qualified technician.

How do I fix Fireye MicroM Flame Safeguard (MC-5000) code 22?

The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.

Other Fireye MicroM Flame Safeguard (MC-5000) codes

16 · Lockout Amplifier High Count Fail19 · Lockout Flame Fail - MTFI20 · Lockout False Flame - STANDBY21 · Lockout Intrlck Open24 · Lockout Chassis Opto37 · Lockout Flame Fail - AUTO39 · Lockout Main Valve54 · Lockout Check Chassis55 · Lockout Check Programmer56 · Lockout Check Amplifier

All 18 Fireye MicroM Flame Safeguard (MC-5000) codes · Every fault code