Rinnai I Series Installation And Operation Manual page 101

140
Heat Exchanger Overheat
•
Overheat switch is tripped.
•
Measure the resistance of the Overheat
Switch.*
•
Check the heat exchanger surface for hot
spots which may indicate blockage due
to scale buildup.
•
Ensure the boiler pump is not locked up.
•
Ensure that all of the valves in the CH
circuit are open.
•
Ensure the boiler and CH circuit does not
have a freezing condition.
•
The surface of the heat exchanger may
turn to a black color as stainless steel is
tempered even in normal conditions.
This does not indicate an abnormal
condition.
•
Check for damage on the exhaust, seal,
and venting.
150
Venturi Control
•
Venturi operation error.
•
Ensure the venturi motor is operating
correctly.*
•
Replace the gas valve assembly.
High Outgoing Temperature
161
•
Safety shutdown because DHW outgoing
temperature is too hot.
•
Check sensor wiring for damage of
outgoing thermistor.
•
Measure resistance of outgoing
thermistor.*
•
Ensure the gas valve has no damage and
the orifice is installed correctly.
•
Replace the gas valve assembly.
Venturi Blockage
170
•
Check the venturi and silencer for
blockage.
•
Before resetting this error, check if the
condensate drain is block and if the
venting is connected properly.
Electrical Grounding
190
•
Secondary circuit ground fault.
•
Check all electrical components for
electrical short.
Condensate Pump (Accessory)
250
•
Boiler will operate for 60 seconds.
•
Confirm wire connections and
harnesses are good.
•
Ensure the condensate reservoir is
empty and condensate pump is
operational.
* See "Electrical Diagnostics" on Technical Data Sheet located on inside front cover of boiler.
Rinnai I-Series Condensing Boiler Combi Manual
341
Inlet Thermistor
•
Check sensor wiring for damage.
•
Measure the resistance of the sensor.
•
Replace if necessary.
353
Supply Thermistor
•
Check sensor wiring for damage.
•
Clean the surface of the sensor.
•
Measure the resistance of the sensor.
•
Check the return thermistor.
•
Replace if necessary.
321
Outgoing Thermistor
•
Check sensor wiring for damage.
•
Clean sensor of any scale buildup
present.
•
Measure the resistance of the sensor.
•
Replace if necessary.
331
Heat Exchanger Thermistor
•
Check sensor wiring for damage.
•
Measure the resistance of the sensor.
•
Replace if necessary.
310
Freeze Protection Thermistor
•
Check sensor wiring for damage.
•
Measure the resistance of the sensor.
•
Replace if necessary.
380
Exhaust Thermistor
•
Check sensor wiring for damage.
•
Clean the surface of the sensor.
•
Measure the resistance of the sensor.
•
Check the return thermistor.
•
Replace if necessary.
363 Return Thermistor
•
Check sensor wiring for damage.
•
Measure the resistance of the sensor.
•
Replace if necessary.
393
Outdoor Thermistor
•
Ensure that DIP switch 1 is set to the
appropriate position.
•
Check sensor wiring for damage.
•
Measure the resistance of the sensor.
•
Replace if necessary.
400
Pressure Sensor
•
Check sensor wiring for damage.
•
Measure the voltage of the sensor.
•
Replace if necessary.
101