Troubleshooting Gas Supply Problem – Saki Corporation

If your water heater stops producing hot water or displays an error code, the issue may be related to the gas supply, fuel, or power source.

This guide explains how to identify your heater type, troubleshoot it safely, and interpret Rinnai error codes (the most common brand found in Okinawa).

🧭 1. Identify Your Water Heater Type

Before troubleshooting, confirm which type of heater is installed in your property.
The steps differ depending on whether your unit uses gas, kerosene, or electric power.

💡 Most Saki Corporation properties are equipped with Rinnai gas water heaters.

🔧 2. Troubleshooting by Unit Type

🔹 A. Gas Water Heater (Rinnai / Noritz)

Step 1 – Check the Gas Supply (stove area)

Make sure the main gas valve is open (handle parallel to the pipe).
Test your gas stove — if it doesn’t ignite, your gas supply may be temporarily stopped.
For LPG users, confirm that the tank still has gas and the valve is open.

Step 2 – Check the Gas Meter / Gas Detector

Locate the gas meter box outside your property.

💡 For mansion, usually gas meter box is located in a small room next to the entrance door, for detached house depending on location, please look for it.
If on the gas detector a red light is blinking (sometimes there's also alarm ringing), gas supply has been shut off automatically.

*Please ensure to confirm the type of gas detector installed at your property.
Press and hold the red reset button until the light stops flashing, then wait 3 minutes before using the water heater.

Step 3 – Reset the Water Heater Remote

Turn off the water heater using the 運転 / 停止 (Power Off) button.
Turn it back on and test the hot water tap.

Step 4 – Check for Error Codes

If an error code appears on your controller (e.g., 11, 12, 16, or 90), refer to the table below.

🔹 B. Kerosene Water Heater (灯油ボイラー)

Step 1 – Check the Fuel Supply

Verify that the kerosene tank is not empty.
Refill the tank if needed.

Step 2 – Restart the Unit

Turn off the unit for 30 seconds, then turn it back on.
If you hear no ignition sound, air may be trapped in the fuel line.

⚠️ If resetting does not solve the issue, proceed to submit a maintenance request

🔹 C. Electric Water Heater (電気温水器)

Step 1 – Check Power Supply

Ensure the breaker is ON and that there is no power outage.

Step 2 – Confirm Heating Schedule

Many electric heaters only heat water during nighttime hours (深夜電力) to save energy.
If no hot water is available during the day, it may automatically reheat later.

Step 3 – Check Control Panel Settings

Confirm that it is not set to Eco Mode or Vacation Mode, which lower water temperature.

💡 If the water remains cold after 24 hours, Submit a maintenance request

📋 3. Rinnai Gas Water Heater Error Code Reference

Code	Meaning	Action	Cause
10	Exhaust blockage	Check vent openings	Air intake or exhaust blocked
11	Ignition failure	Ensure gas valve is open	No gas / igniter issue
12	Flame extinguished	Restart heater	Weak flame / sensor issue
13	CO sensor activated	Stop use & ventilate area	Poor airflow / CO detected
14	Overheat protection	Let cool & restart	Heat exchanger overheat
16	Abnormal water temperature	Restart	Blocked water circuit
17	Water leak detected	Contact maintenance	Leak / sensor error
19	Voltage or wiring issue	Contact maintenance	Short circuit / wiring
29	Drain blockage	Inspection needed	Clogged neutralizer
31–34	Sensor fault	Restart	Thermistor malfunction
38	CO sensor malfunction	Stop use & call service	Sensor damage
52	Gas valve abnormal	Restart	Faulty internal valve
61	Fan motor issue	Restart	Fan not rotating properly
72	Flame detection circuit error	Restart	Faulty flame rod
90	Vent blockage	Clean vent & restart	Obstructed exhaust system
99	System shutdown	Stop use & call service	Severe blockage / internal fault

⚠️ If you see CO or ventilation-related codes (10, 13, 38, 90, 99):
Immediately stop using the heater, open nearby windows, and contact maintenance.

🔗 Can’t Find Your Error Code?

If your displayed code is not listed in the table above, please refer to the official Rinnai support page (Japanese only):
👉 https://faq.rinnai.co.jp/category/show/106?page=2&site_domain=default&sort=sort_access&sort_order=desc

💡 Tip: Use your browser’s translation feature (e.g., Chrome’s “Translate Page”) to view the page in English or another language.

📞 4. Contact Maintenance

If the problem persists after checking the above steps, please proceed to submit your request for maintenance.

Type	Description	Common Brands
Gas Water Heater (給湯器)	Heats water using city gas or propane (LPG). Most common in Okinawa.	Rinnai, Noritz
Kerosene Water Heater (灯油ボイラー)	Uses stored kerosene fuel in an outdoor tank.	Toyotomi, Corona
Electric Water Heater (電気温水器)	Uses electricity to heat and store water.	Mitsubishi, Panasonic