Save A Service Call - Rinnai PRESTIGE Operation & Installation Manual

SAVE A SERVICE CALL

Before calling Rinnai for service, perform the fault finding steps in the Table 1. If the problem persists, contact
Rinnai.
Service calls attending to any condition or fault that is not related to the Rinnai product and components may
be chargeable.
Table 1 - Troubleshooting
Problem
Insufficient or no hot Water
WARNING
Insufficient or no hot Water
Continued
Rinnai Australia
SAVE A SERVICE CALL
Cause
Booster heating not operating
Or
Insufficient gas supply for gas boosted heating
system
Excessive hot water 
consumption
Incorrect Solar system size
Temperature and pressure relief valve /
Expansion Control valve
discharging water continuously
• Never replace the PTR valve with one which has a higher pressure rating than is specified for your water heater.
• If the valve discharges hot water at high flows, (dumps) there may be a serious problem. Switch off the power
supply in the meter box (the switch marked 'WATER HEATER' or 'HOT WATER') or the isolating switch installed
near the water heater and contact Rinnai.
Electric boosted Systems: 
Check to ensure the electric isolating switch(es) at the switchboard (usually marked
"Hot water" or "water heater") is switched 'ON'.
Check to ensure that the electric fuses for hot water at the switchboard are intact.
Gas Boosted Systems: 
Check to ensure the power cord of the gas booster is plugged in and the power point
switched '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 not less than 2.4 
L/min. gas the gas booster burners will not light if it is less than 2.4 L/min. Check the
isolation valve in the gas line is opened.
If there is gas supply to other appliances in the rest of the house, try lighting another
gas appliance.
Refer to your plumber to ensure the gas line has been purged of air after installation.
Electric Boosted Systems:
If the water goes cold, are you using more hot water than you think? Often end
users are surprised at the amount of hot water used, especially when showering. If
the amount of hot water used during the day exceeds the storage capacity of the
cylinder, it is likely that there will be insufficient hot water. Has your plumber install
water saving fixtures and/or flow control or pressure limiting valves to reduce
consumption.
Gas Boosted Systems:
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.
Have your plumber install water saving fixtures and/or flow control or pressure
limiting valves to reduce consumption.
Check correct size gas booster is fitted.
Do you have the correct system size and configuration for your requirements? Refer
to Rinnai literature for information.
Pressure and Temperature Relief (PTR) valve
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 bucket of water
during a 24 hour period or discharges continuously there may be another problem.
If the valve dribbles continuously, try easing the valve gear for a few seconds as
described under 'Regular Care'. This may dislodge any foreign matter and alleviate
the problem.
If the valve discharges at high flows, especially at night, it may be as a result of the
water pressure exceeding the design pressure of the water heater. Ask your installer
to fit a Pressure Limiting Valve (PLV).
Expansion Control Valve (ECV) - if fitted
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 bucket of water
during a 24 hour period or discharges continuously there may be another problem. 
If the valve leaks continuously, try easing the valve gear for a few seconds as
described under 'Regular Care'. This may dislodge any foreign matter and alleviate
the problem. If this does not alleviate the problem contact Rinnai.
8 Solar Split Systems Operating / Installation Manual - Version 8 18/10/10
Remedy