Other Errors - Rinnai E75CRN 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
Insufficient quantity of
hot water
Temperature drop of the
DHW (Combi)
radiators do not get hot
enough or warming them
up takes too long
78
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 flow reducing valve.
3. In the absence of positive results Lime scale in plate heat exchanger. If necessary
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 flow 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.
descale or replace
Check left = hot, right = cold
Check flow 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 filter check dimensions of pipes.