Rinnai Pro Series Operation Manual page 17

Issue Possible causes
Temperature setting may be higher
than the ambient room temperature
Heat exchanger on the indoor /
outdoor unit is dirty
Air filter is dirty
Air inlet or outlet of either unit is
blocked
Poor cooling
Doors and windows are open
performance
Excessive heat generated by sunlight Close windows and curtains during
Low refrigerant due to leak or long-
term use
Too many sources of heat in the room
(people, electronics, etc.)
Too much or too little refrigerant in the
The unit starts
system
and stops
frequently
Malfunctioning compressor
Cold air is entering through doors and
windows
Poor heating The outdoor temperature is extremely
performance low
Low refrigerant due to leak or long-
term use
LED screen flashing or displaying an error code
Operational codes such as 'CL' (clean filter), 'nF' (replace filter), and dF (defrost) etc. are a normal
part of operation. The screen may also display an error code. Error codes begin with letters and
then numbers, for example:
• E(x), P(x), F(x)
• EH(xx), EL (xx), EC(xx)
• PH(xx), PL(xx), PC(xx)
Sometimes an error code will resolve itself. If not turn the unit off, turn off the mains power to
the unit, wait a few minutes, then turn everything back on. If the error code remains contact your
installer or Rinnai for advice.
Solution
Lower the temperature setting
Service person required to clean the
heat exchanger
Remove the filter and clean
Turn the unit off, remove the
obstruction and turn it back on
Make sure doors and windows are
closed while the unit is on
periods of high heat or bright
sunshine
Service person required
Reduce amount of heat sources
Service person required
Service person required
Make sure all doors and windows are
closed during use
Use a secondary heating source
Service person required
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