Applicable Systems
EX-300
Symptoms
The boiler reports a flame detector fault. The flame scanner or UV sensor is not detecting flame correctly.
Possible Causes
- Flame detector lens contaminated
- Detector element degraded from aging
- Detector wiring or amplifier fault
Troubleshooting Steps
- Step 1: Clean the flame detector lens
Lens is clean and unobstructed - Step 2: Test the detector element response
Detector responds to flame correctly - Step 3: Verify the detector wiring and amplifier
Circuit is intact and amplifier works
How to Reset
To reset: Repair or replace the flame detector, then clear the alarm.
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Source: Miura Boiler Operation Manual, Miura Corporation
Category: Boiler
Published: 2026-09-29
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