Rational Combi Oven Ignition Controller Error 37: Bottom Burner Flame
Ignition controller error 37 on a floor-standing gas SelfCookingCenter or iCombi oven means a flame current was measured one second before the gas valve opened on the bottom hot air burner. Turn off the gas supply valve at the oven and do not run the top burner alone. Call us with the number shown.
High: a critical gas error that can lock cooking and may involve a valve that does not seal.
- Code
- Ignition controller error 37
- Maker
- Rational
- Equipment
- Combi ovens
- Applies to
- Automatic ignition controller (SCC / iCombi gas units)
What does Rational Ignition controller error 37 mean?
Floor-standing gas Rational ovens have two hot air burners, and the automatic ignition controller watches each one. Error 37 is the bottom burner version of error 17. It means a flame current was measured one second before the gas valve opened on the bottom burner, a time when no flame should exist. The oven counts it as a critical gas error toward Service 140, so repeated occurrences can lock cooking. The controller is seeing a flame signal that does not match a burner that is off. That can come from a flame sensing wire or electrode carrying a false signal, a bottom burner gas valve that leaks by and does not close fully, a controller that misreads flame current, or a gas supply or connection problem near the bottom burner. The valve case is the one that matters for safety. A valve that does not seal can let gas reach the burner when the oven expects none. The oven should not be run on one burner while it reports critical errors.
Affected models and control systems
This applies to floor-standing gas Rational SelfCookingCenter and iCombi ovens with the automatic ignition controller, per Technical Information TI_2220. Other generations of ovens may number their messages differently.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Ignition controller error 37 on the display
- The bottom burner locked out
- A Service 140 message after repeated errors
- Uneven or reduced cooking performance
Possible causes
Listed in Rational's documentation
- Flame sensing wire or electrode on the bottom burner carrying a false signal
- Bottom burner gas valve that leaks by and does not close fully
- Ignition controller that misreads flame current on the bottom burner
- Gas supply or connection problem near the bottom burner
Other likely causes — what usually sits behind Ignition controller error 37 on this control. A technician confirms which one it is before any part is replaced.
- Grease and moisture collected in the bottom burner chamber where the floor-standing design catches spills
- Valve seat worn from heavy daily cycling
- Sensing wire damaged by heat near the lower burner
Safe checks before calling for service
- Turn off the gas supply valve at the oven.
- If there is a gas smell, step out of the building and phone the gas utility from outside.
- Do not run the top burner alone.
- Call us with the number shown. The covers stay on, and nobody touches the burner area.
How a technician diagnoses Ignition controller error 37
- Read the error log and the Service 140 count.
- Check gas supply, pressure and connections at the oven.
- Inspect the bottom burner electrode, sensing wire and chamber.
- Test the bottom gas valve for sealing.
- Measure the flame current signal before the valve opens.
- Replace the failed part and confirm a clean start with a gas leak check.
- The bottom burner sits low in the cabinet, in a gas-fired chamber that must stay closed unless a technician is testing.
- A leaking valve needs gas test equipment and trained judgment.
- Running a floor-standing oven on one burner while it reports critical errors hides the problem that locks it later.
How Ignition controller error 37 differs from similar codes
Error 37 is the bottom burner version of error 17 and applies to floor-standing models.
Technical reference
- Document
- Technical Information TI_2220 New gas service messages 140
- Edition
- TI_2220_en-GB V02.1, 05/2023 (sheet dated 21/09/2022, series 2022/20)
- Models / control
- Automatic ignition controller (SCC / iCombi gas units)
- Section
- Trigger criteria and warning levels, printed pp. 1-2 of 4 (Service 140.4 / 140.8); ignition controller error list 17, 18, 22, 37, 38, 42 on p. 3-4 near the end of the sheet
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Rational combi oven error codes
Why not run the top burner alone?
The oven is reporting a critical gas error, and running on one burner can hide the problem.
Is error 37 on every Rational gas oven?
It applies to floor-standing models with a bottom burner.
Does it count toward Service 140?
Yes, each occurrence adds to it.
Need help with Rational Ignition controller error 37?
A technician confirms the cause on site and gives you the price in writing before any work starts.