Fault Codes - REMEHA Gas 110 Eco 115 Installation And Service Manual

8.2 Fault codes

In the event of an error message, both the "code"-display and the
display will flash.
See Table next page for details.
§ 4.9 for readout of the most recent faults.
Before resetting, accurately record the fault code (including
figures, flashing digits and dots) and remember to pass on this
informtion when seeking assistance. The fault code is important
for correctly and rapidly tracing the nature of the fault.
Code Description
Flame simulation
Short circuit 24 V
No flame or no ionisation (after 5 start
attemps)
Note:
Ionisation measurement in Volts between
terminal 4 and earth
§ 10.2.4 (1 V dc
External influence
Setting failure
Failure of internal communication bus
Safety interlock
Flow temperature too high
Return temperature too high
26/01/2009 - 300014883-001-F
Cause/check points and remedy
- Gas valve shuts but burner surface continues to glow due to incorrect combustion.
- Gas valve off but leaking on shut-down - burner flame continuing.
Check wiring.
a. No ignition spark, check:
- connection of ignition cable and spark plug cap
- ignition cable and electrode for insulation breakdown
- electrode gap ; must be 3-4 mm
- earth continuity
b. Ignition spark, but no flame, check if:
≡
µA
1 dc)
- gas cock is open
- inlet gas pressure is sufficient
- gas pipe is vented
- gas valve is energised during ignition and also opens
- electrode is fitted properly, is clean and set
- the gas/air ratio is correct
- the gas pipe is not clogged or incorrectly sized
- the air supply and flue outlet is free of obstructions
- if the condensate siphon is clear
- there is no flue gas recirculation (internal/external)
c. Flame, but no or insufficient (<2
Visual check of flame:
- is flame core visible?
- is flame pattern stable?
- check CO
- check ignition probe earthing
- check temperature sensors for loss current (humidity on sensors)
- is analog control (0 - 10 V) volt free?
Visual check of ignition/ionisation probes:
- check distance between both probes, i.e. 3 to 4 mm
- remove ceramic fibers between the burner and the ionisation electrode
- clean if required
Voltage failure after lock out condition - original lock out cause will not be displayed - check
read out table for additional fault code
§ 4.9
Power or control supply affected by external EMC - check for EMC conformity
Check parameter
- Short circuit in flat cable: replace flat cable
- Water/condensation on display
- Possibly external EMC contamination
- Fuse F2 of the Comfort Master is defective
Check:
- the waterflow
§ 5.3
- system for trapped air
- sensors for resistance at set temperature
Table § 10.5
- if the boiler is full of water (minimum pressure 0.8 bar)
Gas 110 Eco 115 / 65
- NOTE: Shutt-off mode (code
not digits) is a normal boiler operating function and does not
represent a boiler failure. However, this may indicate a system
problem, an internal fan check or an incorrect parameter setting.
§ 7.2.2
µA
) ionisation,
at both part and full flame
2
(second digit must be
, only dots in -display are flashing,
)
43