E30: Momentary Loss Of Communication; E31: Pumpline Reversing Switch Failure/High Cycle; Rate; E99: Loss Of Communication - Graco Reactor H-VR Repair And Parts Manual

Motor Control Diagnostic Codes
2. Allow motor to cool completely. Check continuity
between pins 1 and 2 on connector J9 on the motor
control board, page 33. If the resistance is infinity,
the motor thermal switch or the wire harness is bad.
Check wiring, measure thermal switch continuity at
motor, and replace failed part.
3. Unplug motor from J9 on motor control board. Install
jumper across pins 1 and 2 on board. If error still
occurs, replace motor control board.
4. If the E27 error is still occurring, the problem is with
the motor control board.
E30: Momentary loss of
communication
If communication is lost between the display and the
motor control board, the display will normally show E99.
The motor control board will register E30 (the red LED
will blink 30 times). When communications are recon-
nected, the display may show E30 briefly (no more than
2 seconds). If the display shows E30 continuously, there
is a loose connection causing the display and board to
repeatedly lose and regain communication.
E31: Pumpline reversing switch
failure/high cycle rate
Failure of a pumpline switch or switch mechanism may
result in a high cycle rate, causing an E31 to occur.
Replace the switch or switch mechanism. See Pumps
Do Not Reverse Direction, page 27.
E31 may also occur if the system is modified to produce
a higher flow rate.
16

E99: Loss of communication

If communication is lost between the motor control dis-
play and the motor control board, or the temperature
control display and the temperature control module, the
affected display will show E99.
1. Check all wiring between the display and the motor
control board and the temperature control module.
Pay close attention to the wire crimping at J13 on
the motor control board (page 34) and (C) on the
temperature control module (page 36). Unplug and
re-plug connectors.
2. Incoming voltage should be 230 Vac. Check the
temperature control module voltage at terminal
block (805) on the circuit breaker module (see page
65). Check the motor control board voltage at
motor/pumps circuit breaker (813), see page 31.
• Check if temperature control module or motor
control board is causing error:
3. Swap display connection on temperature control
module (C) with display connection on motor control
board (J13).
4. If error no longer occurs, the board or module was
at fault. Switch connections back to ensure connec-
tor was not poorly connected.
313540L