Dexon Canada Air Systems Inc
OWMDH Series Use Manual
Version 07.2019
Page
13
6.1 STATUS INDICATION TROUBLE SHOOTING GUIDE
“Power On”
LED is NOT on
1. Check control power to TB7 in blower heater.
2. Check control power fuse and for short circuits.
3. Check fuse on 95DH Main Controller.
4. Check 95DH Main Control Board for damage or
for short circuit.
5. Check that the transformer on 95DH Main
Controller hasn’t come lose or is damaged.
6. Check for 12VDC between brown and grey wires
to the status board at TB3 on 95DH Main
Controller and the same wires on the status
board.
1. Restore power.
2. Replace fuse if required.
3. Replace fuse if required.
4. Replace or have 95DH Main
Controller repaired.
5. Send 95DH Main Controller in for
repairs if required.
6. If 12VDC is not present check
connections, for short circuit or
controller damage and send in for
repair if required.
“Fan Stopped”
LED is on
1. Check the
“Low Temp.” LED for indication of a
“Low Temp.” shut down condition.
2. Check fan;
if it’s not running check fan terminals
for corrosion, frost build up or impeller
restrictions.
3. Check for fan power at TB5 on 95DH Main
Controller; if no power, check connections, for
short circuit or controller damage.
1. If shut down press the
“Reset”
switch.
2. Remove restrictions and replace
fan if required.
3. If damaged replace or send 95DH
Main Controller in for repairs.
“Low Temp.”
LED is on
1. Check for element power at TB8 in blower
heater.
2. Visually inspect all Klixon thermostat(s) on the
elements and on the Heat Sink above the
elements for damage
3. Ensure the unit is not in
“Manual” mode.
4. Check that the fan voltage is set as per
specifications (see quality control test report).
5. Check if the
“Overheat” LED is on.
1. Restore power.
2. Replace damaged Klixon
thermostat(s) if required.
3.
Set to “Auto” and press “Reset”
switch.
4. Adjust as required.
5. If on see
“Overheat” LED below.
“Overheat”
LED is on
1. Check overheat thermostat for continuity
between the leads at TB4 on 95DH Main Control
Board. It should be in a closed circuit condition.
2. Check element relay(s) for current leakage by
disconnecting control power to eliminate any
demand and check for a current draw on the
element power supply leads.
1. If in open circuit condition check
the thermostat for damaged leads
and replace as required.
2. If there is current draw and there is
no demand replace the relay(s).
“
Element”
LED is off or
inactive
1. Check that the ambient outdoor temperature is
not above the discharge set point as indicated on
the quality control test report in appendices.
2. If the ambient temp. is below the set point check
if unit is in “Low Temp.” shut down condition or
“Overheat” due to corroded overheat thermostat.
3. Check that there is power to the status board and
TB7 on the 95DH Main Controller.
1. If the ambient temperature is
above the set point then there is
no demand; unit is working as
intended.
2.
Refer the “Low Temp.” shut down
and “Overheat” conditions above.
3. Refer to status b
oard “Power On”
condition above.
If the above recommendations do not solve the problem please contact Dexon Canada Air
Systems at 403-930-1284 or email [email protected]
6. TROUBLE SHOOTING GUIDES
