MASCOT MSTWW, Инструкция по установке и эксплуатации

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Mascot ST Tankless Water Heater Page 53
7.1 Diagnostics Section 7
–
Troubleshooting
Diagnostics and suggested corrective actions
This controller is able to record information about the water heater’s condition for the ten previous faults or errors. Refer to the ‘Error
Code’ section of this Manual, (Section 6).
Display Condition Diagnostic Corrective Action(s)
Nothing shown on
display control panel
and blower running at
full speed.
Panel is not
receiving power.
Check wiring for short
circuit or incorrect wiring.
Correct wiring per wiring diagram including con-
nection of transformer to the control.
Check for 14V output of
panel wire.
Push the ‘A’ button of control panel.
Nothing
is shown in display
control panel and no
other Water Heater
components are
operating.
Control is not
receiving 120V
power.
Is there 120 Volts at the
manual switch?
Correct the power supply from the manual
switch.
Check the water heater
inside power manual switch.
Turn on the manual power switch inside the
water heater case.
Check for 120 volts at the
line voltage terminal inside
the water heater case.
Correct wiring inside the water heater case
using the wiring diagram in this manual.
Nothing is
shown on
control panel,
but water heater is oper-
ating.
Occurs when the
communication is
lost from the control
to the display.
Check for loose connec-
tions and proper pin
alignment/ engagement on
the Control's plug.
Check for continuity on the wire harness from
the display to the control panel. See repair parts
section for proper replacement part.
Cycle power off and on
using water heater power
switch and check for
operation.
Replace with new display module. See repair
parts section for proper replacement part.
TEMPERATURE
RISE TOO
QUICKLY
Occurs when supply
water temperature
in heat exchanger
rises faster than 2°F
per second during
the
first two minutes the
burner is on.
Automatically resets after a
few minutes delay or use
manual reset.
See the message displayed TEMPERATURE
SENSOR and follow procedures for loose
connections.
TEMPERATURE
SENSOR
Occurs when a
temperature sensor
has electrically
shorted(SHORT) or
has become
disconnected
(OPEN).
Reset using manual.
Reset screen on control
panel. (Power button)
Check all the temperature readings of the water
heater on the DIAGNOSTICS - TEMPERA-
TURES menu to determine if any sensors are
currently displayed as SHORT or OPEN.
Check wire harness for loose connections and
pin engagement at sensor Connection and
Control module.
If problem persists after checking items above,
replace Control. Refer to the installation manual
32~36page.