REMEHA Gas 310 ECO Technical Information page 45

Failure Description
Flame simulation, (flame
00
detected when control is in the
off position)
01
Short circuit in 24V circuit
No flame or ionisation (after 5
02
start attempts)
03
Gas valve multiblock defective
F03
Fuse 3 defective
(does
not flash)
04
Permanently locked out
No processor handshake (or
05
external influences)
Input failure; sensors are short
06
circuiting
07
Gas valve multiblock relay fault Gas valve multiblock defective or not connected
Air pressure differential sensor
08
does not maintain check level
Fault on internal communica-
11
2
tion bus (I C-bus) when reading
EPROM
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Cause/check points
- Burner glows as a result of a high CO
- Check the combined ignition/ionisation electrode (gap should be 3 to
4 mm apart).
- Gas valve multiblock is leaking or is stuck in the open position.
Check and replace valve.
Check:
- Wiring to sensors
- Wiring to gas valve multiblock.
a. No ignition spark. Check:
- Connection of ignition cable and spark plug cover
- Ignition cable and electrode for 'breakdown'
- For 'flash over' between spark plug cover and earth
- Electrode distance, should be 3 to 4 mm between pins
- Condition of burner set (burner set/ electrode seal)
- Earth.
b. Ignition spark present, but no flame. Check the following:
- The gas cock is open
- There is sufficient inlet gas pressure (20 - 30 mbar)
- The gas pipe has been bled
- The gas valve multiblock is energised during ignition and actually
opens
- The electrode is clean and fitted correctly
- The gas pipe is not blocked/ fitted incorrectly
- The air supply or flue gas discharge is not blocked/fitted incorrectly
- The gas/ air mixture is set correctly.
c. There is a flame, but there is insufficient ionisation (< 2 uA). Check:
- The condition of the electrode and earth
- The temperature sensors for leakage current
Control unit does not recognise gas valve multiblock.
Check the following:
- The wiring on the gas valve multiblock has been connected (cor-
rectly)
- The gas valve multiblock is not defective (burnt out/ short-circuit).
Replace fuse 3
Mains voltage has been disconnected during lock-out.
Solution: reset (original lock-out usually returns automatically).
Fault in control unit or fault due to EMC influences
Reset first, if fault persists replace control unit.
If fault still persists, locate and remove possible external EMC sources.
Check the wiring of the temperature sensors.
If fault persists, replace control unit.
If fault still persists, locate and remove possible EMC sources.
Check:
- The air supply or flue gas discharge for blockages/ installation faults
- The air pressure differential switch and connections.
Check:
- The multiple wire cable in the instrument panel for short circuit
- For moisture on the display
- Find and remove any EMC sources.
46
Remeha Gas 310 ECO
percentage.
2