MHS Boilers STRATA 3 220, Instructions For Installation, Servicing & Operation, Page: 31 / 47

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STRATA3
6.6 screen display
The screen display indicates information about the operating condition of the Strata 3 in plain text. The
displays are distinguished as operation messages (non flashing) and fault messages (flashing).
6.6.1 operation messages (non flashing)
In the case of the following status signals, the Strata 3 is in normal operating mode.
Standby No heat demand (boiler not required to be on)
Pre-Purge Combustion chamber is being pre-ventilated with air from the burner fan
Ignition The ignition sequence of the burner is initiated
Heat-operate The boiler is operating in central heating mode
Tap-operate The boiler is operating to produce domestic hot water
Flue-emission The boiler is operating in test mode at mid output to enable flue gas emissions to be checked (auto
expires after 10 min)
10 min Low The boiler is operating in engineers test mode for adjustment purposes (auto expires after 10 min)
Post Purge Combustion chamber is being post ventilated with air following boiler operation
Limit F/R The flow and/or return temperature is too high (currently)
Fan high The burner fan is running too fast (currently)
Fan low The burner fan is running too slow (currently)
Fault room u There is a fault with the modulating unit (RE 2132) or Cascade manager (KKM2) or a fault in the wiring
to these controls (in the case of the RE 2132 controlling the boiler runs continuously in heating mode
to protect the building)
Fault Outside There is a fault in the outside air sensor or in the wiring to the sensor or the DIP switches are
incorrectly set to ask the boiler to look for an outside sensor when there is none installed.
Service The service interval time has expired and the boiler should now be maintained (1 year)
Serv. Button The service button is being depressed.
De aeration/venting The boiler pump if fitted is operating to remove any possible collection of air from the heat
exchangers. (Occurs when power turned off/on and after reset of fault).
6.6.2 operating data display
The second line of text displays values such as temperature, percentages etc and the red reset button
may be used to scroll through (for information) the values of the various sensors that are/may be
connected in the boiler plus fan speed.
* These values in the table are displayed only if the corresponding sensor/corresponding room unit are
connected to the Strata 3.
The normal status indicator is returned by pressing the ‘reset’ button once more after the
display (PUMP 1). If the ‘reset’ button is not pressed for 4 to 5 minutes, the normal status display
returns automatically.
T1: Flow temperature
T4: Return temperature
T5: Domestic hot water temperature*
—-: Thermostat opened, or no sensor/thermostat connected
00: Thermostat closed
T6: Outside temperature*
T7: Mixer supply flow temperature* (MR 03)
Room 1: PWM signal from the room unit for the standard heating circuit*
Room 2: PWM signal from the room unit for the mixer circuit*
Speed: Fan speed
Table 7 - Sensor Identification