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Troubleshooting
Do not attempt to carry out any work other than that mentioned in this
troubleshooting section. If you have any other faults or problems, please contact
your installer, or contact Rinnai.
Problem
Lack of hot
water or no hot
water
Lack of hot
water or no hot
water
Lack of hot
water or no hot
water
Water is too hot If possible check the temperature of the water coming out of a hot
High electricity
bills
6 | Low pressure indoor copper cylinders: Owner and installer guide: 20733-D 04-18
Possible solution
Is there electricity supply to the cylinder?
Check that the isolating switch marked 'hot water' or 'water heater', at
the meter box, is switched on. Also check any isolating switches near
the water heater are switched on.
Check the fuse or circuit breaker marked 'hot water' or 'water heater'
at the meter box. Repeated failure of the fuse or tripping of the circuit
breaker indicates a fault, which must be investigated by an authorised
tradesperson.
Most hot water cylinders are controlled at peak times by your electricity
supplier via a ripple relay. Contact your electricity supplier to determine
if there have been any issues with the power supply.
Are you using more hot water than you think?
Often you don't realise how much water is actually being used. This
applies especially when showering. Typical flow rates for showers is
approximately 8-10 litres per minute. Conduct a simple experiment
by placing a measured bucket under your shower for ten seconds and
multiply by six to determine the amount of water produced over a
minute. If your result is significantly more than the rates mentioned you
may want to consider installing a low flow shower rose―available at all
good plumbing stores.
Cold water relief valve discharging continuously?
It is normal for the cold water relief valve to discharge a small quantity of
water through the drain line. If water is discharging continuously there
may be a fault with one of the valves, contact the installer to discuss.
water tap with a thermometer. If it is higher than 55 °C then this
indicates a problem with your system—contact an electrician for
advice.
If you think your electricity bill is too high, investigate the following:
• Has your electricity tariff changed?
• Is your cold water relief valve discharging continuously?
• Are you using more hot water than normal?
• Has there been any leaking hot water pipes, or taps?
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