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Typical Heating and Hot Water control system using
3-port mid-position valve
1
ROOM
'STAT
CALL
WHITE
BLUE
OR
BROWN
MID-POSITION VALVE
The above control system is available as the Danfoss
Randall 102E5 HEATSHARE pack, which also includes
the TW room thermostat, AT cylinder thermostat, HS3 mid-
position valve and a WB12 wiring box.
8
2
3
LINK
COM
CYL.
'STAT
SAT
N
GREY
5
COM
CALL
RED OR
ORANGE
L
6
102E5
TERMINALS
L
MAINS
N
SUPPLY
FUSED
3 AMP
BOILER &
N
PUMP
TERMINALS
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Do you have a question about the 102E5 and is the answer not in the manual?
Questions and answers
why wont my boiler start and go off via the time clock it is set to auto
Your Danfoss 102E5 boiler may not be starting and stopping according to the timer set to auto due to several possible reasons:
1. Incorrect Programming – Verify that the programmed ON and OFF times are correctly set.
2. Manual Overrides Active – Check if the +1HOUR or ADVANCE override buttons are activated, as they can temporarily alter the schedule.
3. Unit Set to OFF – The ADVANCE function does not work if the unit is set to OFF, so ensure it is in AUTO mode.
4. Power Supply Issues – Confirm that the unit is receiving power (230V supply).
5. Wiring Issues – Ensure all wiring connections, including zone valves and thermostats, are properly connected.
6. Battery Backup Failure – If there is a battery backup issue, the unit may lose programmed settings and not function as expected.
7. Faulty Unit – If the above checks do not resolve the issue, the unit itself may be faulty and require inspection or replacement.
Check these factors to diagnose the issue and restore proper operation.
This answer is automatically generated