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SAVE A SERVICE CALL
Before contacting Rinnai for service, please follow the fault finding guide. If the problem persists or this information
doesn't answer your questions, contact Rinnai on the phone number on the back of this manual. Service call outs
attending to any condition or fault that is not related to Rinnai product or components may be chargeable.
INSUFFICIENT OR NO HOT WATER
Booster heating not
operating
OR
Insufficient gas supply for
gas boosted heating system
Excessive hot water
consumption
Gas Booster Setting
Temperature and pressure
relief valve / expansion
control valve discharging
water continuously
NO WATER FROM THE HOT TAP
Restriction in the hot tap
or failure of the cold water
supply to the heater
GAS BOOSTER OPERATING TOO FREQUENTLY
Insufficient Sunlight /
Collectors Shaded
Solar control unit switched
off
WATER FLOW FLUCTUATIONS
High hot water usage
WATER HAMMER
Hot and cold water
plumbing in the premises
Rinnai
Check to ensure the power supply to the gas booster system is 'ON'.
Check gas is available and turned 'ON'.
Close the hot tap and wait for 10 seconds and open it again. The hot tap must be
opened enough to ensure that the flow rate is sufficient to cause the gas booster(s) to
light.
Check the isolation valve in the gas line is opened.
If there is gas supply to other appliances in the building, try lighting another gas
appliance.
Refer to your plumber to ensure the gas line has been purged of air after installation.
Refer to the manual supplied with your boosting system for more information
Insufficient flow may occur if multiple outlets are in use at the same time and exceed
the rated flow capacity of the gas booster. If so, reduce the number of outlets in use.
Consider discussing with your installer, fitting water saving fixtures and/or flow control
or pressure limiting valves to reduce consumption.
The delivery temperature of the gas boosting system is normally 65°C. If the
temperatures are higher than this, the flow of water through the gas booster will reduce
and may result in insufficient flow rate. Ensure the boosting system is set for the
temperature the system was designed for.
It is normal and desirable that this valve allows a small quantity of water to be
discharged during the heating cycle. If it discharges more than a standard bucket
of water during a 24 hour period or discharges continuously there may be another
problem
If water continuously dribbles from the valve, try easing the valve gear for a few
seconds as described in the section 'Safety Devices' on page 6. This may dislodge
any foreign matter and alleviate the problem.
If the valve discharges at high flows, contact your installer or Rinnai to discuss.
Check for water flow at the other hot taps and that the cold water isolation valve is fully
open
Reduced sunlight due to overcast weather in summer or low solar contribution in winter
will result in an increased dependence on gas boosting. Higher gas use bills under
these conditions, especially in winter, are normal.
Ensure the trees or other objects are not shading onto the collector surface (Trim the
trees or relocate the solar collector if the obstruction is permanent).
Make sure the glass on the collector is not dirty.
Check that positioning and alignment of solar collectors is in accordance with the
section 'System Orientation and Inclination' on page 13.
If the solar control unit is switched off there will be no solar pre- heating of water
resulting in the water being heated entirely by electricity or gas' boosting'
Check the power outlet for the solar control unit is switched on
Higher than normal number of hot taps in use at the same time may cause a decrease
in the hot water flow from the taps.
Contact your installer or a plumber to discuss checking the clipping of hot and cold
water pipe work and install a pressure limiting valve or water hammer arrestor as
required
30
DD FP Solar Pre Heat System OIM
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