18
H4123 025961 Rev. A July 2012
Installation and Owner’s Manual – Heat Pump
What Should I Check Before Mak-
ing A Service Call?
If, after checking the troubleshooting
points in the following section, the
problem has not been identified, please
contact the distributor from whom you
purchased the system.
Note:
It is important to know that there
are no user serviceable components
in the system, so it is recommended
that no covers be removed and no
adjustments made to the system
settings by anyone other than an
authorised representative.
Water Discharge From Pressure &
Temperature Relief Valve (PTR)
It is not unusual for a small quantity of
water to discharge during the heating of
water in your storage tank. The amount
of discharge will depend on hot water
usage and size of the storage tank.
As a guide, it will discharge 3% of the
storage capacity of water in the heating
period.
Continuous Trickle From PTR
This is most likely due to a build up of
foreign matter. In this case, try gently
raising the easing lever on the PTR Valve
for a few seconds, then release gently.
This may dislodge a small particle of
foreign matter and rectify the fault.
Steady Flow From PTR
This may be caused by excessive water
supply pressure, a faulty PTR Valve, or a
faulty thermostat. Turn off the electricity
supply, turn off the water, and contact
your Rinnai agent.
No Hot Water
• Is the Pressure & Temperature Relief
Valve discharging too much water?
• Do you have the correct size water
heater for your requirements? Sizing
details are available from your Rinnai
supplier.
• Is one outlet (such as the shower)
using more hot water than you think?
• Carefully review the family’s hot
water usage and if necessary
check the shower flow rates with a
bucket, measuring the amount of
water used over that period of time.
If it is not possible to adjust water
usage patterns, an inexpensive flow
control valve can easily be fitted to
the shower outlet.
• Consider that during night time
heating, the time taken to heat the
tank can take longer (less energy in
the air) so you may find that the tank
has not fully recovered from a period
of heavy usage the previous evening.
• Consider that often the hot water
usage of showers, washing machines
and dishwashers can be under
estimated. Review these appliances
to determine if your daily usage is
greater than the storage volume of
your water heater. For example, if
Troubleshooting
