Common Error Codes Blank Display - Hayward HeatPro HP50TA Troubleshooting Manual

Summit Display
Summit
Common Error Codes
Blank Display
A blank display is an indication of no low voltage to control.
A tripped breaker is a likely cause.
On HeatPro models a blown 1 amp fuse will result in a blank
Troubleshooting a Blank Display
Check for 240 volts to contactor at L1 and L2
terminals. If there is 240 volts at L1 and L2 check for
24 volts between blue and yellow wires coming from
transformer.
On Summit units
and yellow wires replace control board.
On HeatPro units
for blown fuse on interface board. If fuse is good
replace control board
Common causes
transformer are pinched or shorted low voltage wires
to low and high pressure switches. Check all wiring
for short or ground
Contactor coil shorted or grounded. Contactors
should have approx. 10 Ohms resistance through
coil, and there should be no reading of continuity to
ground.
Replace contactor if resistance exceeds 12 Ohms, or
there is any continuity to ground.
Check for 24 volts AC at
blue and yellow wires
display
if 24 volts are present at blue
if 24 volts are present check
of blown fuse or bad
HeatPro Display
HeatPro
1 Amp fuse to protect
low voltage circuit
HeatPro only