Satronic / Honeywell DKO 970/972 Oil Burner Control
Satronic / Honeywell DKO 970/972 Oil Burner Control 2 short + 3 long flashes: Flash-Code: 2 short then 3 long pulses (stray light)
The oil burner control locks out because it detects stray light during the monitored phase.
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
- 2 short + 3 long flashes
- Name
- Flash-Code: 2 short then 3 long pulses (stray light)
- Controller
- Satronic / Honeywell DKO 970/972 Oil Burner Control
- Type
- Sensor fault
- 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 4 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 Satronic / Honeywell DKO 970/972 Oil Burner Control 2 short + 3 long flashes mean?
The oil burner control locks out because it detects stray light during the monitored phase.
Is Satronic / Honeywell DKO 970/972 Oil Burner Control 2 short + 3 long flashes 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 Satronic / Honeywell DKO 970/972 Oil Burner Control 2 short + 3 long flashes?
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 Satronic / Honeywell DKO 970/972 Oil Burner Control codes
1 short + 1 long flash · Flash-Code: 1 short then 1 long pulse (i1 short + 2 long flashes · Flash-Code: 1 short then 2 long pulses (1 short + 4 long flashes · Flash-Code: 1 short then 4 long pulses2 short + 8 long flashes · Flash-Code: 2 short then 8 long pulses (
All 5 Satronic / Honeywell DKO 970/972 Oil Burner Control codes · Every fault code