REMEHA W40 Installation And Maintenance Instructions Manual page 36

Description
0 0. Flame simulation
0 1. Short-circuit 24V
0 2. No flame
or no ionisation
(after 3 starts)
0 4 Control fault
0 8. Air transport
1 2. Control fault
1 8. Max. water
1 9. temperature
2 4. Temperature
sensor fault
2 5. Maximum water
temperature
2 8. Fan does not run
2 9. Fan keeps running
3 0. Max. water temp.
3 1. Temp.sensor fault
3 2.
3 6.
3 7.
4 3. Parameters out
of reach
6 1. Air transport
Note:
Not mentioned codes refer to internal control errors,
requiring the control box to be changed.
Cause/checkpoints
Check ionisation probe (distance 3 - 4 mm).
Check wiring.
a. no ignition spark (visible through inspection glass).
Check: - connection of ignition cable and spark plug cap.
- ignition cable and electrode for breakdown.
- electrode distance; must be 3-4 mm.
b. ignition spark, but no flame.
Check if: - gas cock is open.
- inlet gas pressure is sufficient.
- gas pipe is vented.
- gas valve is energized during ignition.
- electrode is fitted properly.
- the gas/air ratio is not correct (see para. 10.1)
- the gas pipe is not clogged or shows an assembly fault.
c. flame, but no ionisation.
Voltage failure when malfunction causes interlock.
a. Fouling/clogging of the air supply, flue gas discharge or heat exchanger;
b. Differential air pressure switch does not function:
- differential air pressure switch defective.
- gas/air connections loose or clogged.
- gas/air connections mixed up.
- spring loaded damper (fig. 06, pos. 7) does not open.
Fuse F1 (3.15 AT) defective.
Flow temperature too high.
Return temperature too high.
a. Flow and return temperature sensors mixed up.
b. Flow and return connections mixed up.
c. Water flow in D.H.W. mode not correct.
Rise in flow temperature too fast.
Check: - circulation pump (position 1 or 2)
- water flow through the unit (sufficient number of radiators opened)
- water pressure (0.8 bar min).
Fan defective or improperly fitted (mechanically or electrically).
Fuse F2 (3.15 AT) defective.
Transformer defective (power on X3?)
a. electrical connections mixed up.
b. electrical connections interrupted.
Difference between flow and return temperature too high
Short-circuit in flow temperature sensor.
Short-circuit in return temperature sensor.
Flow temperature sensor defective or not connected.
Return temperature sensor defective or not connected.
Check the parameter settings.
Air differential switch does not open:
- Air differential switch defective
- Extreme draft through flue gas discharge duct
- Short-circuit in wiring.
36
remeha W40/60-m ECO