POWER
Check the Power Source
Ensure your hot water unit (HWU) is plugged into its own power point (GPO). Unplug it and test another appliance (like a phone charger or desk lamp) to confirm the power point is working.
Reset the Unit
Leave your HWU unplugged for a few minutes to clear any potential error lockouts.
Contact an Electrician
If the power point isn't working, reach out to an electrician for assistance.
WATER
Minimum Flow Rate
Most HWUs require a minimum water flow of about 2.5 liters per minute to operate. If the flow is below this, the unit may not turn on.
Check the Inlet Strainer
A blocked strainer can restrict water flow. Follow this video link for instructions on checking your strainer on your hot water unit: Rinnai Hot Water Unit Strainer Check.
Note: If your HWU is part of a gas-boosted solar hot water system, skip this step to avoid scalding risks. Only qualified technicians should check the strainer in such systems.
Inspect Fixtures
Blocked aerators or shower heads can significantly reduce water flow. If you notice that hot water is functioning at one fixture but running cold at another, this often indicates a blockage.
Testing for Blockages
Run Two Hot Water Taps Simultaneously. If both fixtures start to run hot, it confirms a blockage in one of the fixtures.
- Contact a Plumber: If a blockage is confirmed, reach out to a plumber to clean the affected fixtures.
Check for Cross Connections
Turn off the cold-water valve on the HWU (located on the middle pipe). If cold water runs from a hot tap when isolated, there's a cross connection. Contact a plumber to investigate.
GAS
Check Gas Valves
Ensure the gas valves to your meter and HWU are turned on. Any other gas-related issues should be handled by a qualified gas plumber.
Further Assistance
If you've checked Power, Water, and Gas and still have no hot water, please contact Rinnai at 1300 555 545 to book a service, or visit our website at Rinnai.com.au.
Thank you for reaching out to Rinnai!
Heating, Cooling & Hot Water Systems | Rinnai Australia
