Complete Guide to Handling Hot Water Heater Issues in Rental Apartments — What to Do When Hot Water Won't Come Out, Strange Noises, and Malfunction Costs

Hot Water Heaters in Rental Apartments Are "Equipment" — Repairs and Replacement Are the Landlord's Responsibility

First and foremost, if a hot water heater in a rental apartment malfunctions, repair and replacement costs are generally borne by the landlord (or property management company). A hot water heater is "equipment" under the rental agreement and is subject to the landlord's obligation to make repairs under Article 606 of the Civil Code.

However, in the following cases, the tenant (resident) may bear part or all of the costs:

• •Tenant's intentional acts or negligence (deliberate misoperation, damage from bumping into it, etc.)
• •Use beyond normal operation (blocking the exhaust port, using non-recommended detergent, etc.)
• •When the tenant independently hires a repair service without consulting the landlord

If you call a repair service without notifying the property management company, you may be responsible for the costs yourself. Always go through the property management company.

Common Hot Water Heater Issues and How to Handle Them

Hot Water Won't Come Out

This is the most common issue. Since there can be multiple causes, check the following in order.

STEP 1: Check the Power and Gas Supply

• •Check that the hot water heater is powered on (the lamp on the unit is not off)
• •Check that the gas supply has not been cut off (test other gas appliances)
• •Check for any unpaid gas bills (gas can be cut off for non-payment)

STEP 2: Check the Water Supply

• •Check that the water shutoff valve is not closed (be especially careful right after moving in)
• •Check for any unpaid water bills

STEP 3: Check the Error Code If an error code appears on the unit's remote control, check the troubleshooting steps for your manufacturer (see below).

STEP 4: Try a Temporary Reset Turn the power off, wait 2-3 minutes, then turn it back on. This can sometimes resolve the issue.

If hot water still doesn't come out after trying Steps 1-4, contact the property management company.

Error Code is Displayed

If an error code such as "E10" or "111" appears on the unit's remote control, the cause varies depending on the code. Here are common error codes by major manufacturer:

Common Error Codes for NORITZ | Code | Cause | Action | |---|---|---| | 111 | Ignition failure | Check gas supply → Contact property management company | | 121 | Overheat prevention | Power reset → If it recurs, contact property management company | | 140 | Overheat safety device activated | Contact property management company (most cases do not self-repair) | | 290 | No gas / low gas pressure | Contact gas company |

Common Error Codes for Rinnai | Code | Cause | Action | |---|---|---| | 12 | Ignition failure | Check gas supply | | 14 | Heat exchanger overheat | Power reset → If it recurs, contact property management company | | 32 | Water temperature sensor abnormality | Contact property management company (part replacement needed) | | 661 | Freeze protection | Wait for the heater to auto-defrost |

In case of freeze error: When the temperature drops to -4°C or below, the water supply pipes may freeze. Leave the heater on in "freeze prevention mode" and wait, or contact the property management company. Attempting to thaw the pipes yourself by pouring hot water on them risks bursting the pipes.

Strange Noises (Rumbling, Noise, Buzzing Sound)

• •"Buzzing" vibration sound: Poor installation of the heater unit or internal fan problem → Contact property management company
• •"Bang" impact sound: Possible water hammer (water percussion) → Slow down the opening and closing of faucets
• •Continuous "clicking" ignition sound: Early sign of ignition failure → After checking gas supply, contact property management company

Strange noises are often an early sign of malfunction, and ignoring them can lead to complete failure. Early notification can actually shorten the repair period.

Hot Water Temperature is Unstable

If the temperature is too high, too low, or fluctuates significantly during showering, consider the following possible causes:

• •Age-related wear of the mixing valve (internal parts of faucet/showerhead)
• •Faulty temperature sensor in the heater
• •Fluctuations in water pressure (common in older buildings and low-pressure areas)

If replacement of the faucet or showerhead is necessary, the cost is borne by the landlord if it is "equipment installed with the unit," but by the tenant if it is "something added later." Check the equipment list from when you moved in.

How to Properly Contact the Property Management Company

If a hot water heater issue occurs, contact the property management company as soon as possible (preferably the same day). Providing the following information when you contact them will help ensure a smooth response:

Information to Provide When Contacting

1. Property name, room number, and your name
2. When the issue started (date and time)
3. What the issue is (no hot water, error code, strange noise)
4. Error code number (if an error code is displayed)
5. Heater manufacturer and model number (listed on the unit)

In case of emergency (gas leak, burning smell, sparks, etc.), first turn off the heater power and close the main gas valve, then call your gas company's emergency line (Tokyo Gas: 0570-002211, etc.).

Rules for Repair and Replacement Cost Responsibility

The statutory useful life of a hot water heater is 6 years, with a practical replacement guideline of 8-15 years. If the heater was installed many years before you moved in, it's reassuring to confirm the repair response procedure with the landlord before moving in.

Coping Strategies While the Heater is Being Repaired

While repairs or replacement are being completed (usually 2-5 days), you can maintain your daily life with the following strategies:

Bathing

• •Use a nearby public bathhouse, super bathhouse, or day-use hot spring
• •Take a bath at a family member's or friend's home
• •Temporarily use a sports gym (shower only)
• •Make hot water with an electric kettle for a sponge bath (primitive but functional)

Washing Dishes

• •Use hot water from an electric kettle
• •Run the dishwasher (if you have one) with cold water
• •Temporarily use disposable dishes

During winter months (November to March), the lack of hot water can easily affect your health, so it's important to tell the property management company that the issue is "urgent" when requesting repairs and ask them to expedite their response.

Summary: Hot Water Heater Troubleshooting Flow

1. Basic checks of power, gas, and water supply (initial troubleshooting you can do yourself)
2. Check the error code and note the number
3. Try a power reset once (if not resolved, move to the next step)
4. Contact the property management company the same day and provide the symptoms, error code, and model number
5. Implement coping strategies (public bathhouse, electric kettle, etc.) until the repair service arrives
6. Verify operation after repair and contact again if there are any issues

A hot water heater is a "lifeline" of rental living. To handle issues calmly when they occur, we recommend that you in advance note the contact information for your property management company and the location of nearby public bathhouses.