Trouble Shooting for Common Issues
I don’t have any hot water when I open the tap.
Make sure there is gas, water, and electricity to the Rinnai water heater (power is turned on and the gas is turned on).
When I was using the hot water, the water got cold.
If you adjusted the flow from the tap to lessen it, you may have gone below the minimum flow required. The Rinnai water heater requires a minimum flow rate to operate. (See the specification page for the flow rate of your model.)
If you are experiencing issues with higher temperature settings, then Rinnai recommends reducing the temperature setting. Selecting a temperature closer to that which is actually used at the faucet will increase the amount of hot water being delivered to the faucet, due to less cold water mixing at the fixture.
White smoke comes out of the exhaust.
During colder weather when the exhaust temperature is much hotter than the outside air, the exhaust fumes condense producing water vapor.
When I open a hot tap, I do not immediately get hot water.
Hot water must travel through your plumbing from the Rinnai water heater to the faucet. The time period for hot water to reach your fixture is determined by the amount of water in the plumbing system between the water heater and the fixture, water pressure, and the flow rate of the fixture.
After I turn off the hot water tap, the fan on the Rinnai water heater continues to run.
The fan is designed to continue running for a short time after the flow of water stops. This is to ensure constant water temperatures during rapid starting and stopping, as well as exhausting any residual gas flue products from the unit.
Accessing Operating Information
Models MC-91 and MCC-91
To display the most recent error codes press and hold the “On/Off” button for 2 seconds. While holding the “On/ Off” button press the ▲ button. The last 9 error codes will flash one after the other. To exit this mode press the “On/Off” and ▲ button as before.
To display the water flow through the water heater press and hold the ▲ button for 2 seconds and without releasing the ▲ button press the “On/Off” button.
To display the outlet water temperature press and hold the ▼ button for 2 seconds and without releasing the ▼ button press the “On/Off” button.
Water Quality
Consideration of care for your water heater should include evaluation of water quality. If the water quality exceeds the target levels provided in the table, you may want to treat or condition the water.
*Source: Part 143 National Secondary Drinking Water Regulations
| Maximum Level |
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Total Hardness | Up to 200 mg / L |
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Aluminum * | Up to 0.2 mg / L |
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Chlorides * | Up to 250 mg / L |
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Copper * | Up to 1.0 mg / L |
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Iron * | Up to 0.3 mg / L |
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Manganese * | Up to 0.05 mg / L |
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pH * | 6.5 to 8.5 |
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TDS (Total Dissolved | Up to 500 mg / L |
Solids) * |
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Zinc * | Up to 5 mg / L |
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14 | VB Series Indoor LS Manual |
