Weishaupt W-FM 200 Combustion Manager
Weishaupt W-FM 200 Combustion Manager code 31: Loc.c 31 / Err.c 31
The burner locks out because the valve proving test detected a leaking first valve or an unopened second 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
- 31
- Name
- Loc.c 31 / Err.c 31
- Controller
- Weishaupt W-FM 200 Combustion Manager
- 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 Weishaupt W-FM 200 Combustion Manager code 31 mean?
The burner locks out because the valve proving test detected a leaking first valve or an unopened second valve.
Is Weishaupt W-FM 200 Combustion Manager code 31 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 Weishaupt W-FM 200 Combustion Manager code 31?
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 Weishaupt W-FM 200 Combustion Manager codes
2D · Loc.c 2D / Err.c 2D2E · Loc.c 2E / Err.c 2E2F · Loc.c 2F / Err.c 2F30 · Loc.c 30 / Err.c 3032 · Loc.c 32 / Err.c 32
All 16 Weishaupt W-FM 200 Combustion Manager codes · Every fault code