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Remeha Gas 3002
32
live and neutral inversion Switch off power and change connections.
switch off power, and change connections.
code not valid. The control unit does not recognize the boiler through the code connector.
check wiring. Check the wiring.
code not accepted. A wiring error has been made or a failure has occurred in the control unit.
please contact qualified personnel. Contact our service department.
flow sensor short circuit. Check the wiring of the respective temperature sensor.
return sensor short circuit. If wired correctly, replace the respective sensor and/or wiring.
heatexch. sensor short circuit.
flue sensor short circuit.
flow sensor open circuit.
return sensor open circuit.
heatexch. sensor open circuit.
flue gas sensor open circuit.
flow sensor overheat Too high temperature has been signalled.
return sensor overheat Check: - the water flow through the boiler/installation
heatexch. sensor overheat - the water level in the boiler
- the operating pressure (0.8 bar min.).
flue gas temperature too high Check: - the set maximum flue gas temperature (see par. 7.3.3, option no. 4)
Minimum setting: 15°C above maximum return water temperature
- the boiler setting
- the boiler for fouling
return temp. higher than heat exch. The return water temperature exceeds the first heat exchanger temperature.
temp. Check: - if the wiring of heat exchanger and return sensors have been inverted
- if the flow direction through the boiler is correct
return temp. higher than The return water temperature exceeds the flow water temperature.
flow temp. Check: - if the wiring of the flow and return sensors have been inverted
- if the flow direction through the boiler is correct
purge airpress. not reached During pre-ventilation the required min. air pressure differential across the boiler is not obtained.
Check: - the flue gas discharge, air supply and/or boiler for fouling
airpress. lost during purge - the diameter of the flue gas discharge/air supply pipes, using the tables of par. 5.5
- measurement tubes for fouling/humidity
insufficient airpress. during stage 1 The air pressure differential at low load is too low. It should be 50 Pa at least.
burning Check: - flue gas discharge, air supply and/or boiler for fouling
airpress. start not reached - fan, frequency regulator (see par. 10.9) and air pressure sensor
airpress. start lost - measurement tubes
insufficient airpress. during stage 2 The air pressure differential at high load is too low.
burning Check: - flue gas discharge, air supply and/or boiler for fouling
- fan, frequency regulator (see par. 10.9) and air pressure sensor
- measurement tubes
airpress. too high at stage 1 The air pressure differential is too high.
Check: - fan, frequency regulator (see par. 10.9) and air pressure sensor
airpress. detected when fan is off During standstill of the boiler too high a standstill draught is signalled (> 25 Pa).
Install a resistance in the flue gas discharge or air supply.
Check connections on air pressure differential switch (LDS).
Instructions
Failure message on LCD-display
32


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