Rinnai E75CN Installation & Servicing Instructions Manual page 74

15.3 Errors
Code Description
Incorrect flame formation. boiler
has not been burning but an
ionization flow (flame) has still
been detected
No flame formation
1 No
between supply (3) and return (4)
2 There is a temperature difference
between supply (3) and
return (4)
Control unit error
The controller has detected a
program error
Control unit error
The error persists after reset Software error control unit. Replace the control unit. Remove the E-Prom from
Control unit error
1 Anticipation resistance wire not
2 Software error control unit. Software error control unit. Replace the control unit. Remove the E-Prom from
74
temperature difference
present
Solution
Check whether the ionization cable and/or the electrode are responsible for a
possible short-circuit. Remove the plugs from the ionization cable connected
to the control unit and to the electrode. Now using a universal meter take a
measurement between the ionization connection and the ground, now refit it
part by part until a short-circuit takes place.
Rectify the short-circuit and if necessary replace this part.
Check the data in Error mode. Boiler data during error.
1 error = 02
2 operational status = 02
3 supply temp. = xx*
4 return temp. = xx*
5 kW burner = xx**
6 % pump = xx*
* = variable value
**= x 3451 = BTU/hr
Boiler has not been able to ignite any gas or has not received any gas. Boiler
tries to start 6 times with an increasing starting load after the safety time
Check whether:
- the gas valve is open;
- there is power to the gas valve;
- that the gas valve opens
The minimum gas pre-pressure during the start must be a minimum of 7"W.C.
(17 mbar), check the 24 Volts in the gas during ignition block's open position
Boiler has gone out after ignition. Due to insufficient ionization the burner
has gone out after ignition
Ionization flow, ionization cable or the O
current should be 4 µA (Check INFO Step 48 for actual value), the O
be 4.7 %
Connector not plugged into the gas valve or defect in the wiring of the gas
valve.
Software error control unit. Replace the control unit. The display will
automatically load the program into the new controller.
Reset the boiler. the boiler automatically indicates this message if during an
error read-out the electrical power to the boiler is shut off. After the power
has once again switched on, if the error causing the interference is no longer
present, this message is given.
Rectify the preceding error, If Error 04 persists, and preceding errors do not
occur, replace controller.
Check 120V stability. If voltage is deviating more between +10% and -15%
the electrical power supply needs to stabilised.
the defective control unit and place it onto the new control unit .The controller
will automatically load the program into the new control unit.
When a power stealing room stat device is placed the connection terminal
needs to be provided with the special anticipation resistance wire.
the defective control unit and place it onto the new control unit .The controller
will automatically load the program into the new control unit.
setting. The minimum ionization
2
should
2