WERCSWERCSDiagnose
All fault codesSee plans

Satronic / Honeywell DKO 970/972 Oil Burner Control

Satronic / Honeywell DKO 970/972 Oil Burner Control 1 short + 2 long flashes: Flash-Code: 1 short then 2 long pulses (low mains voltage)

The mains voltage dropped too low, causing the burner control box to lock out until voltage recovers.

Code
1 short + 2 long flashes
Name
Flash-Code: 1 short then 2 long pulses (low mains voltage)
Controller
Satronic / Honeywell DKO 970/972 Oil Burner Control
Type
General 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 3 common causes listed for this code
  • 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 Satronic / Honeywell DKO 970/972 Oil Burner Control 1 short + 2 long flashes mean?

The mains voltage dropped too low, causing the burner control box to lock out until voltage recovers.

Is Satronic / Honeywell DKO 970/972 Oil Burner Control 1 short + 2 long flashes dangerous?

It is graded green: in a working tech's wheelhouse with standard tools and low risk.

How do I fix Satronic / Honeywell DKO 970/972 Oil Burner Control 1 short + 2 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 + 4 long flashes · Flash-Code: 1 short then 4 long pulses2 short + 3 long flashes · Flash-Code: 2 short then 3 long pulses (2 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