Installation Guide

Rinnai I-Series Condensing Boiler Combi Manual 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 condion.
• The surface of the heat exchanger may
turn to a black color as stainless steel is
tempered even in normal condions.
This does not indicate an abnormal
condion.
• Check for damage on the exhaust, seal,
and venng.
150
Venturi Control
• Venturi operaon error.
• Ensure the venturi motor is operang
correctly.*
• Replace the gas valve assembly.
161
High Outgoing Temperature
• 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 orice is installed correctly.
• Replace the gas valve assembly.
170
Venturi Blockage
• Check the venturi and silencer for
blockage.
• Before reseng this error, check if the
condensate drain is block and if the
venng is connected properly.
190
Electrical Grounding
• Secondary circuit ground fault.
• Check all electrical components for
electrical short.
250
Condensate Pump (Accessory)
• Boiler will operate for 60 seconds.
• Conrm wire connecons and
harnesses are good.
• Ensure the condensate reservoir is
empty and condensate pump is
operaonal.
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 Protecon 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 posion.
• 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.
* See “Electrical Diagnoscs” on Technical Data Sheet located on inside front cover of boiler.