Riello RDB 2.2 Burner Control (MO 535 - MPF)
Riello RDB 2.2 Burner Control (MO 535 - MPF) Red + green inverted flashing (2.5s/0.5s): Reset button: red and green inverted flashing
The burner control locks out due to an internal control circuit fault driving the oil valve.
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
- Red + green inverted flashing (2.5s/0.5s)
- Name
- Reset button: red and green inverted flashing
- Controller
- Riello RDB 2.2 Burner Control (MO 535 - MPF)
- Type
- Gas valve proving
- 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 Riello RDB 2.2 Burner Control (MO 535 - MPF) Red + green inverted flashing (2.5s/0.5s) mean?
The burner control locks out due to an internal control circuit fault driving the oil valve.
Is Riello RDB 2.2 Burner Control (MO 535 - MPF) Red + green inverted flashing (2.5s/0.5s) 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 RDB 2.2 Burner Control (MO 535 - MPF) Red + green inverted flashing (2.5s/0.5s)?
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 RDB 2.2 Burner Control (MO 535 - MPF) codes
Red steady on · Reset button: steady redOrange steady on · Reset button: steady orangeRed blinking (0.5s/0.5s) · Reset button: red blinkingRed fast blinking (0.2s/0.2s) · Reset button: red fast blinkingGreen + red blinking (0.5s/0.5s) · Reset button: green and red blinkingOrange + green blinking (0.5s/0.5s) · Reset button: orange and green blinkingOrange + green fast blinking (0.2s/0.2s) · Reset button: orange and green fast blinRed + orange inverted flashing (2.5s/0.5s) · Reset button: red and orange inverted fl
All 9 Riello RDB 2.2 Burner Control (MO 535 - MPF) codes · Every fault code