Troubleshooting Guide -
Tranquility
®
Digital (DXM2) Packaged Units
Rev.: 01/15/14
8
Geothermal Heat Pump Systems
Continued
Confi gure
No
See Lockout
Faults on page
51 under ‘Fault
Codes’
Is there more
than one unit
sharing a
common loop?
No
Properly confi gure
unit. See Section 3.3
and Section 3.4 on
page 57.
Does this unit
have a Variable
Speed Pump and
is it confi gured for
parallel pumping?
No
Yes Yes Yes
Is the thermostat
confi gured for the proper
model of the unit?
(Example: TZ036) This is
found on thermostat’s unit
confi guration menu.
Yes Yes
Does the unit have the
correct ECM Motor? Check
the ECM table, which is in
the unit’s IOM.Compare to
the motor in the unit.
Verify pump is
supplying enough fl ow
using Pressure Drop
Software. Closed loop
2.25 - 3.0 gpm per ton.
Replace with
correct motor
No
The unit
periodically
locks out on LT1
in heating or
high pressure in
cooling
ATC Thermostat
says ‘ECM
Confi guration
Error’
The unit does
run but ATC
Thermostat
says ‘Service
Needed’
Yes
Troubleshooting Flow Chart
This is the Unit
Performance Sentinel
causes in cooling mode
if LT2 is less than 40° or
LT1 is 125° or greater. In
heating mode if LT2 is 125°
or greater.
Go to Faults
Code 8.
A-F
Next Page
No
No
No
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