Gabarron MATTIRA MAS18 Instrucciones De Instalacion Y Uso página 38

7.2 OVERHEAT LOCK-OUT & RE-SETTING
Central heating overheat.
If the boiler detects an overheat condition of 100ºC (80ºC if adapted floor heating) in the central heating circuit a safety
thermal limit switch will operate and switch the boiler off disabling all functions.
The cause of the overheat should be investigated.
The safety limit switch is on the right underside of the boiler and
will require re-setting manually by following the procedure
shown:
Unscrew & remove the black cap and push the small pin behind
it until you hear a click.
The limiter will not re-set until the temperature in the heating
header drops below 100°C or 80°C if the boiler is adapted for
radiant floor heating.
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.
A 7l/min flow rate is required. 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 5.5)
- 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). It may be sufficient to maintain one radiator with permanently open valves however
it is recommended 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
i
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
On pushing button the display will show
the tables (see 5.1).
On pushing button again the display will show
moment.
followed by the temperature value of the return probe of the heating circuit.
followed by the value of the limited maximum output according to
followed by the actual modulated output power at that
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