Installation Guide

Installation & Servicing Instructions Rinnai Q-Series
72
16.3 Errors
Code Description Solution
Incorrect fl ame formation. boiler
has not been burning but an
ionization fl ow (fl ame) has still
been detected
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 refi t it
part by part until a short-circuit takes place.
Rectify the short-circuit and if necessary replace this part.
24 Volt short-circuit Check the 24 Volt connection. Remove all plugs with 24 Volt connections such
as: fan, pump, any three-port valve and 24 Volt plug to the connecting block.
Check short circuit of disconnected components. Switch on power again to the
control unit with the components disconnected. Reconnect the components,
which have been checked and are working.
Rectify the short-circuit or replace the short-circuited component.
No fl ame formation 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
1 No temperature difference
between supply (3) and return (4)
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
2 There is a temperature difference
between supply (3) and
return (4)
Boiler has gone out after ignition. Due to insuffi cient ionization the burner
has gone out after ignition
Ionization fl ow, ionization cable or the O
2
setting. The minimum ionization
current should be 4 μA, the O
2
should be a minimum of 4.4% for NG or 4.8%
for LP
Control unit error 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.
The controller has detected a
program error
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.
Control unit error Check 120V stability. If voltage is deviating more between +10% and -15%
the electrical power supply needs to stabilised.
Check the ribbon cable between the control unit and the display. Incorrect
data will be detected in case of a poor connection between the control unit
and the display. If necessary, replace the ribbon cable between these two
components.
The error persists after reset Software error control unit. replace the control unit. The controller will
automatically load the program into the new control unit.
Control unit error Moisture on the PCB. Check if there is water leaking on or in the boiler.
Stop leak and replace MCBA controller