Other Errors - Rinnai E75CN Installation & Servicing Instructions Manual

15.4 Other Errors

Complaint
Central heating but no
domestic hot water
Hot water but no central
heating
Central heating
installation gets hot
without being requested
Insuffi cient quantity of
hot water
Temperature drop of the
DHW (Combi)
radiators do not get hot
enough or warming them
up takes too long
Description
1. -Key of the DHW program is not
switched on
2. Flow switch is not working properly.
3. T3 DHW sensor in plate heat exchanger
defective
4. When using RS100
5. Three-port valve is not circulating to
DHW
1. -Key of the central heating program
is not switched on.
2. Room thermostat (on/off) is not giving
any signal to the boiler.
3. RS100 with outdoor sensor
(Room sensor-On)
4. Three-port valve is not circulating to
central heating position.
1. -Key pump program is on.
2. Dirt in three-port valve or three-port valve
cartridge is binding.
1. Hot and cold water connection to the
boiler mixed up.
2. Incorrect fl ow reducing valve.
3. In the absence of positive results
1. Hot and cold water connection to the
boiler mixed up
2. Flow reducing valve.
3. DHW power for the boiler is set too low.
1. Check setting of room thermostat or
RS100
2. Supply water temperature too low.
3. Incorrect choice of installation
4. Installation resistance too high (given an
average T > 36°F the boiler decreases
the load).
Solution
Switch on DHW program on the Control Tower
Check fl ow and/or check for impurities. Check
on functioning. Replace if necessary.
Replace DHW sensor
- Check timer times for DHW program,
if necessary reset
- RS100 does not respond to DHW program
- See RS100 installation instructions
- Check wiring.
- If necessary replace the three-port valve
motor.
Switch on central heating program
Check room thermostat
- Outdoor temperature is higher than 70°F,
depending upon the Eco-temperature set
(70°F is the default). Check Info chapter
Step 7 or temperature is higher than the
Eco temperature set (see RS100 installation
instructions).
- Check timer program and set room
temperature.
Check wiring, replace the three-port valve
motor.
Switch off.
Clean or replace.
Check left = hot, right = cold
- Check for the type and for contamination, if
necessary replace (Combi) and/or clean.
- Check the comfort synchronising valve for
the correct setting in accordance with the
installation instructions.
Lime scale in plate heat exchanger. If
necessary descale or replace
Check left = hot, right = cold
Check fl ow reducing valve for the correct type
in accordance with the installation instructions
- Check PARA chapter Step No. 43
- Check the functioning and wiring of the
DHW sensor T3.
See installation and user manual RS100
Check setting PARA chapter Step No. 1 and
increase if necessary
PARA chapter Step No. 2 if necessary change.
- See installation instructions.
- Check / clean water fi lter check dimensions
of pipes.
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