Kromschroder PFU 780 / PFU 760 Burner Control Unit
Kromschroder PFU 780 / PFU 760 Burner Control Unit code 3: Blinking 3
The pilot burner flame failed during the proving period, causing the system to lock out.
Safety first. This code involves a gas, flame or electrical hazard. 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
- 3
- Name
- Blinking 3
- Controller
- Kromschroder PFU 780 / PFU 760 Burner Control Unit
- Type
- Flame failure
- 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 July 23, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 3 common causes listed for this code
- 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)
Questions about this code
What does Kromschroder PFU 780 / PFU 760 Burner Control Unit code 3 mean?
The pilot burner flame failed during the proving period, causing the system to lock out.
Is Kromschroder PFU 780 / PFU 760 Burner Control Unit code 3 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 Kromschroder PFU 780 / PFU 760 Burner Control Unit code 3?
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 Kromschroder PFU 780 / PFU 760 Burner Control Unit codes
2 · Blinking 24 · Blinking 45 · Blinking 56 · Blinking 67 · Blinking 78 · Blinking 810 · Blinking 10
All 15 Kromschroder PFU 780 / PFU 760 Burner Control Unit codes · Every fault code