Page No 46 of 56 Reznor, RHC21 4000 Installation EN May 2021 D301334 Issue 0
Does the
burner remain running
after several
minutes?
NO
YES
Does the burner attempt
to relight?
YES
CHECK: -
1. LED status light flash codes.
2. LC3 safety thermostat reset switch.
3. LC3 safety thermostat temperature not exceeding 96°C (71°C for models 10 and 20)
4. Lockout reset switch.
5. Heat demand still present.
CHECK: -
1. Throttle positioning – see commissioning data table.
2. Flame sensor probe corroded.
3. Flame signal (min. 1.0µA).
4. Flame sensor probe bent.
5. LC1 safety thermostat temperature not exceeding 95°C.
6. Air inlet / flue pipe for obstructions.
7. Integrity of chamber insulation.
YES
YES
YES
NO
Page 2
END
If the heater still fails to operate
correctly, contact your local
representative.
NOTE: presence
of a flame is
indicated by
the green lamp
illuminating.