Diagnostic Codes - Rinnai SENSEI RSC160i Installation And Operation Manual

5.6 Diagnostic Codes

To display diagnostic codes:
Turn off the water heater by pressing the "On/Off" button.
Press and hold the "On/Off" for 2 seconds and then the  (Up)
button simultaneously.
The last nine maintenance codes display and flash one after the
other.
To exit diagnostic codes and return the water heater to normal
operation, press and hold the "On/Off" button for 2 seconds and
then the  (Up) button simultaneously.
Turn on the water heater by pressing the "On/Off" button.
WARNING
Power interruption during bath fill
03
(Water will not flow when power returns)
• Turn off all hot water taps. Press ON/
OFF twice.
By-Pass Flow Control
05
• Measure resistance or voltage values
of the by-pass flow control.*
• Replace By-Pass flow control device.
Air Supply or Exhaust Blockage/
10
Condensate Trap is Full
• Ensure condensate line is not blocked.
• Ensure internal air filter 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.
* See "Electrical Diagnostics" on Technical Data
Sheet located on inside front cover of water
heater.
72
Some of the checks below should be performed by a trained and
qualified professional. Consumers should never attempt any action that
they are not qualified to perform.
Rinnai Tankless Water Heater Installation and Operation Manual
Figure 75
No Ignition (Heater Not Turning On)
11
• 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 flame rod wire is connected.
• Ensure igniter is operational.*
• Check gas solenoid valves for open or
short circuits.*
• Verify gas orifice is correct.
• Ensure condensate line is not blocked.
No Flame
12
• 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 flame rod wire is connected.
• Ensure gas type and inlet gas
pressure is correct.
• Bleed all air from gas lines.
Heat Exchanger Overheat
14
• Measure resistance or voltage of
Overheat Switch.*
• Check heat exchanger surface for hot
spots which indicate blockage due to
scale build-up.
• Refer to instructions in manual for
flushing 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.