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The following steps are for troubleshooting the geothermal heat pump. If the problem is with the domestic hot water , pro-
ceed to that section at the end of the troubleshooting guide. Repair procedures and reference refrigeration circuit diagrams
can be found at the end of the troubleshooting guide.
STEP 1: Verify that the display is present on the heating or cooling aquastat. If it is not present on either, proceed to POWER
SUPPLY TROUBLE SHOOTING, otherwise proceed to STEP 2.
STEP 2: Remove the door and electrical box cover and check to see if there is a fault code on the control board. If
there is, record the fault code. Turn the power off, wait 10 seconds and turn the power back on. Set
the appropriate aquastat for a call for heating or cooling depending on the season.
STEP 3: If a 24VAC signal does not appear across Y1 and C of the terminal strip, proceed to the AQUASTAT TROUBLE
SHOOTING section, otherwise proceed to STEP 4.
STEP 4: If a fault code appears once a signal is present at Y1 and the compressor does not attempt to start,
proceed to the FAULT CODE TROUBLESHOOTING section, otherwise proceed to STEP 5.
STEP 5: If no fault codes appear and the compressor does not attempt to start, attempts to start but cannot, starts hard, or starts
but does not sound normal, proceed to the COMPRESSOR TROUBLESHOOTING section, otherwise proceed to
STEP 6.
STEP 6: If the compressor starts and sounds normal, this means the compressor is OK and the problem lies
elsewhere. Proceed to the OPERATION TROUBLESHOOTING section.
NOTE: To speed up the troubleshooting process, the Test Jumper on the control board can be placed to the YES
position to change the anti-short cycle timer to 5 seconds. Be sure to set it back to NO when servicing is
complete.
Fault
Possible Cause
No power to the
Disconnect switch open
heat pump
(if installed)
Fuse blown /
Breaker Tripped.
No display on
Transformer breaker
either aquastat.
tripped.
Faulty transformer
Faulty wiring between
heat pump and aquastats.
Faulty aquastat.
02 JULY 2009
Troubleshooting Guide
POWER SUPPLY TROUBLESHOOTING
Verify disconnect switch is in the ON
position.
At heat pump disconnect box,
voltmeter shows 230VAC on the line
side but not on the load side.
Breaker on transformer is sticking
out.
Transformer breaker is not tripped,
230VAC is present across L1 and L3
of the compressor contactor but
24VAC is not present across R and
C of the terminal strip.
24VAC is not present across 24V
and COM at the top of the aquastat.
24VAC is present across 24V
and COM of the aquastat but there
is no display.
Page 25
Verification
Recommended Action
Determine why the disconnect
switch was opened, if all is OK
close the switch.
Reset breaker or replace fuse
with proper size and type. (Time-
delay type "D")
Push breaker back in. If it trips
again locate cause of short circuit
and correct.
Replace transformer.
Correct the wiring.
Replace aquastat.
Boreal Geothermal Inc.
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Table of Contents
Troubleshooting
