Marco Uber Boiler - Display and Controls

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Service manual April 2017 Uber boiler
2.2 THE DISPLAY AND CONTROLS
The Display screen contains 4 lines of information:
1. First line on the display shows status message:
Status
Description
PRIME FILL
Tank is filling, not heating until reaches the middle level probe.
Boost button disabled.
PRIME HEAT
Tank is heating, not filling until temperature in the tank reaches
“Prime temp”. Boost button disabled.
PRIME READY
Tank is heating and refilling. Temperature is maintained around
“Prime temp” value. Boost button is operational and puts machine into
BOOST mode. Tank is not full yet.
PRIME READY
FULL
Tank is heated up to the “Prime temp” and reheats once the
temperature falls 0.5°C below “Prime temp”. Boost button is
operational and puts machine into BOOST mode. Tank is full.
EMPTYING THE
TANK
Pump is running allowing to dump all water from the tank through the
font. Inlet disabled. Option triggered by pressing PRIME button for
more than 5 seconds. Press PRIME again to quit.
BOOST TEMP:
xx.x °C
Machine in BOOST mode. Water inlet disabled.
Shows the target temperature set by pressing and holding BOOST
button. Machine heats up to the set temperature and maintains it
within ±0.2 °C. Press PRIME button to go back to PRIME mode.
LOW TANK
LEVEL !
Machine in BOOST mode – Tank Level is below 2 litres.
Only when in LARGE TANK Mode (Service Set up Menu #8)
Communication
error!
Display board lost communication with boiler PCB (can not receive
serial data about temperature and level probes). All actions cancelled.
Whenever communication is restored, machine will go back to PRIME
FILL mode.
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Top water level probe covered while low level not. Check low level
probe for scale. Boost button disabled.
Tank thermistor err!
Tank thermistor disconnected or short circuited. Boost button
disabled.
Font thermistor err!
Font thermistor disconnected or short circuited. Boost button
disabled.