Environmental Express HotBlock CAL 3300 - Manual (Page 17)

P
lease consult the following troubleshooting guide if you experience problems with your HotBlock. See wiring
schematic (page 14-15) for component identification. If you are unable to resolve the problem or if replacement
components are necessary, please contact technical service at 1-800-745-8218 as component replacement varies in
degree of difficulty. We recommend that only qualified personnel attempt troubleshooting electrical components.
When the HotBlock is initially powered on, the controller will cycle through a self-test sequence. It will then display the
current temperature and begin heating until it reaches your set point temperature, where it will hold until the unit is
powered off. The set point may be changed at any time. A change in the controller’s factory default settings or a failed
component may cause the HotBlock to perform unsatisfactorily or render it inoperable.
The controller digital display will not illuminate.
There are two possible reasons that your controller will not illuminate.
n The controller is not getting voltage or;
n The controller itself has failed internally.
The problem can be effectively diagnosed by determining if the controller is or is not getting voltage using the
following steps :
1. Confirm that the power cord is plugged securely into the HotBlock receptacle and a working outlet.
2. Confirm that the switch is in the “on” position. Press button on the back of HotBlock.
3. Check the fuse located in the power module :
a) Locate the fuse drawing indented into the power module next to the socket.
b) Using a small screwdriver, pry open the fuse compartment cover.
c) Examine the exposed fuse for a break in the filament and if necessary, check for continuity using a volt-meter.
d) If the fuse is determined to be blown, replace it with the spare fuse located in the slide-out compartment
beneath the operating fuse.
Caution: This procedure is a potential electrical hazard and should only be performed by qualified personnel.
4. Inside the HotBlock, check voltage leading from the power module to the controller:
a) Remove the bottom panel of the HotBlock by unscrewing the rubber feet.
b) On the back of the controller, locate the black wire at terminal 6 and white wire at terminal 8.
c) Set your volt-meter on AC voltage.
d) Touch your red lead to the exposed white wire and black lead to the exposed black wire.
e) If your volt-meter reads 110-122V, the controller is receiving power but has failed internally. It must be
replaced (see parts list, page 13).
f) If your volt-meter registers less than 110-122V, using step d above check the black and white wires at
the terminal board and then at the power module to determine if there is a faulty connection.
The audible alarm has sounded immediately after powering on and the HotBlock will not heat.
There are two possible causes for your HotBlock to sound the alarm immediately after the controller cycles through
the self test. These are:
n Your set point has been set to a value (
≥
) 15° less than ambient or current set point temperature. Turn the set
point to within 15° of the actual temperature (blue numbers)
n There the controller is faulty. Call Environmental Express at 1-800-343-5319 for more information
Environmental Express • 16
Troubleshooting Guide
HotBlock Operation Guide
Call 1.800.343.5319