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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.
8 MAIN COMPONENTS LIST
i
Heating expansion vessel 6L
ref. 60091510
DHW. expansion vessel 3L
ref. 60105580
DHW. expansion vessel hose MAC
ref. 60105560
50 L DHW. insulated tank
ref. 60100072
Insulated heating header tank
ref. 60101700
Circulation pump RKC130
ref. 60190076
Main electronic PCB MAC
ref. 60105585
Power PCB MAC with support
ref. 60105595
Keyboard MAC
ref. 60105555
Temperature sensor white
ref. 60105600
Temperature sensor black
ref. 60105605
15 kW heating resistance & joint 140
ref. 60100750
15 kW DHW. resistance & joint
ref. 60100700
DHW. resistance joint
ref. 60100068
¾” heating flow detector
ref. 60100805
0-4 bar pressure gauge
ref. 60100820
100°C thermal limiter
ref. 60101860
80°C thermal limiter
ref. 60101870
Automatic purge
ref. 60091280
3 bar central heating relief valve
ref. 60100840
7 bar DHW. P&T relief valve
ref. 60105660
DHW. retention valve
ref. 60100830
½” filling / shut off valve
ref. 60091160
Adhesive controls cover 220x60
ref. 60100502
Adhesive controls cover 140x50
ref. 60100508
