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WARNING
Figure 72
Rinnai Tankless Water Heater Installation and Operation Manual 73
5.6 Diagnostic Codes
To display diagnostic codes:
Turn o the water heater by pressing the “On/O” button.
Press and hold the “On/O” for 2 seconds and then the (Up) button
simultaneously.
The last nine maintenance codes display and ash one after the other.
To exit diagnostic codes and return the water heater to normal
operation, press and hold the “On/O” button for 2 seconds and then
the (Up) button simultaneously.
Turn on the water heater by pressing the “On/O” button.
Some of the checks below should be performed by a trained and qualied
professional. Consumers should never attempt any action that they are not
qualied to perform.
03
Power interruption during bath ll
(Water will not ow when power returns)
• Turn o all hot water taps. Press ON/
OFF twice.
05
By-Pass Flow Control
• Measure resistance values of the by-
pass ow control.*
• Replace By-Pass ow control device.
10
Air Supply or Exhaust Blockage/
Condensate Trap is Full
• Ensure condensate line is not blocked.
• Ensure internal air lter is clean with
no obstructions. (Indoor Water Heaters
Only)
• Ensure High Altitude setting. (See
Parameter Settings)
• Ensure Combustion air and Exhaust
vents are not blocked and approved
venting materials are being used.
(Indoor Water Heaters Only)
• Ensure vent length is within limits.
(Indoor Water Heaters Only)
• Check fan for debris and ensure wheel
turns freely.
• Verify check valve is not stuck between
fan casing and burner body.
11
No Ignition (Heater Not Turning On)
• Check that the gas is turned on at the
water heater, meter, or cylinder.
• If the system is propane, make sure that
gas is in the tank.
• Ensure gas type and inlet gas pressure
are correct.
• Bleed all air from gas lines.
• Check the ground wire for the PC Board.
• Ensure ame rod wire is connected.
• Ensure igniter is operational.*
• Check gas solenoid valves for open or
short circuits.*
• Verify gas orice is correct.
12
No Flame
• Check that the gas is turned on at the
water heater, gas meter, or cylinder.
• If the system is propane, make sure that
gas is in the tank.
• Ensure ame rod wire is connected.
• Ensure gas type and inlet gas pressure
is correct.
• Bleed all air from gas lines.
14
Heat Exchanger Overheat
• Measure resistance of Overheat
Switch.*
• Check heat exchanger surface for hot
spots which indicate blockage due to
scale build-up.
• Refer to instructions in manual for
ushing heat exchanger. Hard water
must be treated to prevent scale build up
or damage to the heat exchanger.
• Ensure it is not in forced Hi setting.
* See “Electrical Diagnostics” on Technical Data
Sheet located on inside front cover of water heater.
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