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7.3 HEATING SYSTEM FLOW SWITCH
–
E3 ERROR & SYSTEM BY-PASS REQUIREMENTS
If the error E3 appears on the display, the flow switch has detected insufficient water flow in the heating circuit and heat
production is disabled to protect the boiler from overheating.
The possible causes for this condition are:
- Insufficient water pressure in the heating system requiring re-filling to 1.5bar
- Pump not circulating or seized. Check as shown (Sect 5.3)
- Blockage in heating circuit from debris or a foreign object in the boiler or pipe-work.
- Insufficient flow rate caused by restrictions such as insufficient size pipe-work, too many bends or isolation valves with
restricted bore.
- Closed radiator valves (Thermostatic). In this situation, it is essential the required minimum flow rate of 7 L/min is
maintained through the boiler during all conditions. It may be sufficient to maintain one radiator with permanently open
valves however the guidance under current Building Regulations relating to the conservation of energy recommends the
fitting of an automatic by-pass valve. This type of valve modulates open when necessary to ensure that the appropriate
minimum flow rate is maintained through the boiler, at all other times it is closed thus preventing unnecessary and wasteful
circulation through the bypass and the boiler.
7.4 CHECKING RATED HEAT OUTPUT
It is possible to check the actual heat power output configuration that is set on the boiler and also the modulated
operating output at that moment.
Press the
button for three seconds.
The heating display will show
followed by the temperature value of the return probe of the heating circuit.
On pushing
button, the display will show
followed by the value of the limited maximum output according
to the tables (see 5.1).
On pushing
button again, the display will show
followed by the actual modulated output power at that
moment.
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