Kromschroder PFU 780 / PFU 760 Burner Control Unit
Kromschroder PFU 780 / PFU 760 Burner Control Unit code 52: Blinking 52
The clearing input is being held active permanently, which prevents the burner control from operating normally.
- Code
- 52
- Name
- Blinking 52
- Controller
- Kromschroder PFU 780 / PFU 760 Burner Control Unit
- Type
- Setup or parameter fault
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated July 23, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 1 common cause listed for this code
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Kromschroder PFU 780 / PFU 760 Burner Control Unit code 52 mean?
The clearing input is being held active permanently, which prevents the burner control from operating normally.
Is Kromschroder PFU 780 / PFU 760 Burner Control Unit code 52 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Kromschroder PFU 780 / PFU 760 Burner Control Unit code 52?
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.
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