Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display)
Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) code 4: No flame at the end of the safety time (2)
The burner control box locks out because no flame was detected at the end of the second safety time.
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
- 4
- Name
- No flame at the end of the safety time (2)
- Controller
- Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display)
- 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 22, 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 Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) code 4 mean?
The burner control box locks out because no flame was detected at the end of the second safety time.
Is Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) code 4 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 Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) code 4?
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 Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) codes
2 · No flame at the end of the first safety 7 · Extraneous light12 · Loss of flame during operation20 · Air pressure errorc: 2 · c: 2 (alternating with d: 1 / d: 2 / d: c: 3 · c: 3 (alternating with d: 0/1/4/20/68/84c: 4 · c: 4 (alternating with d: 0/1/2 and comb
All 24 Riello RS/E BLU Burner Control (REC 27.100A2 with RDI21 display) codes · Every fault code