Installation Sheet

Rinnai Tankless Water Heater Installaon and Operaon Manual 61
4.5 Diagnosc Codes
Some of the checks below should be performed by a licensed professional. Consumers
should never aempt any acon that they are not qualied to perform.
WARNING
To display diagnosc codes:
1. Turn o the water heater by pressing the “On/O” buon.
2. Press and hold the “On/O” for 2 seconds and then the (Up)
buon simultaneously.
3. The last 9 maintenance codes display and ash one aer the other.
4. To exit diagnosc codes and return the water heater to normal
operaon, press and hold the “On/O” buon for 2 seconds and then
the (Up) buon simultaneously.
5. Turn on the water heater by pressing the “On/O” buon.
1
2
03
Power interrupon 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 obstrucons.
(Indoor Water Heaters Only)
• Ensure High Altude seng. (See Parameter Sengs)
• Ensure Combuson air and Exhaust vents are not blocked
and approved venng 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 Ignion (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 operaonal.*
• Check gas solenoid valves for open or short circuits.*
• Verify gas orice 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 instrucons 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 forced Hi seng.
15
Venturi Control
• Ensure the Venturi motor is operang correctly.*
• Replace gas valve assembly.
• Clear diagnosc code by reseng the main power supply
to the water heater.
16
High Outgoing Temperature
(safety shutdown because water heater is too
hot)
• Conrm fan motor is funconing correctly.
• Replace the gas valve assembly.
17
Venturi Blockage
• Ensure Venturi isn't blocked.
• Please call Rinnai technical department.
19
Electrical Grounding
• Check all components for electrical short.
* See “Electrical Diagnoscs” on Technical Data Sheet located on inside front cover of water heater.