www.geyserwise.co.za
E9
E8
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www.geyserwise.co.za
Instruction
manual
Error codes
How to deal with error indication - below information relevant for pumped solar systems only
When the tank reaches a maximum temperature of 80°C, the pump will be switched off to stop more hot
water circulating to the geyser. This is totally normal operation and can be reduced as per the instructions.
Firstly, with the increased amount of solar radiation, we want to ensure that you get the greatest possible
savings out of your system, reducing the electrical backup to zero or as close as possible to zero with all
or most of your water heating coming from solar.
The second matter is to minimize overheating of the solar collector on your roof. One of the safety features
of GeyserWise, is to have the solar circulation shut down when the water in your geyser reaches 80°C. This
is to prevent dangerously high temperature levels in the geyser which could blow other safety valves. When
the circulation shuts down on a hot day, because water is no longer circulating in the solar collector, the
temperature in the collector very quickly rises. This can result in steam generating in the collector and also
loud bubbling when a hot tap is opened allowing steam to bubble into the geyser. While systems are
designed for this, excessive heating may have an influence on the lifespan of the system.
Ways in which you can improve this situation:
1. Reducing the electrical backup temperature to ensure the temperature is as low as possible early in
the morning (preferably below 30°C). Reduce the temperature to the minimum setting of 30°C from
about October until the end of March. This effectively means that the element does not switch on at
all for six months of the year and all water heating is from solar. On the GeyserWise controller, use the
following procedure to ensure the element seldom or never switches on:
Press the SET button once and a temperature setting will appear.
Use the V button to reduce this setting to the minimum of 30°C. Should you find that you do not
have sufficient hot water you may need to vary this setting, using as low a temperature as possible
to ensure you have enough hot water but using as little electricity as possible.
Press the SET button again and another temperature setting will appear, repeat the above procedure.
Repeat this procedure twice more. There are four temperature settings on the GeyserWise which
are for different periods of the day.
2. For immediate alleviation consider letting some hot water out of the geyser by turning the hot water
tap on. Consider water wastage in this instance.
3. Should an E8 error occur on a frequent basis during summer (daily), also consider covering part of the
solar panel with shade cloth or remove heat pipes in the case of evacuated tube systems.
For safety purposes, please also ensure installation of tempering valves to ensure water leaves the
tap at a maximum of 55°C to 60°C
Error code: Pump failure
Possible cause
An E9 error code occurs when the pump is powered on but the temperature in the collector does not
decrease. This could be due to a pump failure or blockage in the system.
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