M thermal Split
202004 53
Procedure 4.2.4
E0 / E8
Water flow switch connection on
hydronic box main PCB is loose
1
Yes
Ensure the switch is connected properly
No
Water flow is insufficient
2
Yes
Check the water piping and valves. Make
sure the water piping is clean, there is no
air in the water piping and all valves are
open. If the internal circulator pump is
not already set to the highest speed,
increase its speed.
No
Water flow switch is damaged
Yes
Replace the water flow switch
No
Internal circulator pump can t work
Yes
Turn off the power, check the wire in the
pump. Once that is done, the pump still
work, replace the pump.
No
Replace hydronic box main PCB
Notes:
1. Water flow switch connection is port CN8 on the main PCB for hydronic box (labeled 9 in Figure 4-2.1 in Part4, 2.2 "Main PCB for Hydronic System").
2. Check water pressure on the manometer. If the water pressure is not > 1 bar, water flow is insufficient. Refer to Figure 2-1.9 in Part 2, 1 Hydronic Box
Layout .
Midea CAC
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