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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
High electricity
bills
6 | MP indoor stainless steel cylinders: Owner and installer guide: 20132-I 09-20
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.
If possible check the temperature of the water coming out of a hot 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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