Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 196

Error definition and error
Error Code
2134 Abnormal wa- 1. If an inlet water tem-
ter tempera- perature of 5°C [41
ture °F] or below, or
50°C[122 °F] or above
is detected (first de-
tection), the heat
source unit comes to a
stop, goes into 3-min.
restart prevention
mode, and restarts af-
ter three minutes.
2. If an inlet water tem-
perature of 5°C [41
°F] or below, or
50°C[122°F] or above
is detected again (sec-
ond detection) within
thirty minutes of the
first detection (See
item 1 above), the
heat source unit
comes to an abnormal
stop and displays the
code "2134."
3. If an inlet water tem-
perature of 5°C[41 °F]
or below, or 50°C[122
°F] or above is detect-
ed again (second de-
tection) more than
thirty minutes after the
first detection (See
item 1 above), it is
considered as the first
detection, and the
same sequence of op-
eration as the one in
item 1 above is fol-
lowed.
detection method
(1) Heat source water pump
failure
(2) Problems with the cooling
tower or heating device
(3) Dirty or clogged water heat
exchanger
(4) Thermistor failure (TH6)
(5) Failure of the thermistor in-
put circuit on the control
board
(6) Thermistor installation
problem (TH6)
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Cause Check method and remedy
[ IX Troubleshooting ]