Slant/Fin CHS-399 - Manual (Page 63)

CHS Series Installation and Operation Instructions │ Slant Fin Corp.
63
Figure 15-1 CHS Control Panel
Figure 14-1 Tft Model
Fuses
The CHS boiler is equipped with three (3) fuses. Check these fuses before replacing the controller or any other
electrical component; if the fuse is blown, it will prevent the protected device(s) from functioning.
To check, and if necessary replace, the fuses:

Remove all 120VAC power from the appliance. Be careful to check that the unit is not powered from more
than one source e.g. a UPS (uninterruptible power supply).

Remove the front cover.

Fuses "A" and "B" are accessible by removing the spring-loaded knurled knob of their respective holders.
Push the knob toward the panel, and twist approximately 1/4 turn counter-clockwise.

Fuse "C" is an auto blade type and is installed in an “inline” fuse holder; gain access by removing the
control panel cover.
After inspecting and if necessary replacing fuses, replace the panel cover and front cover. Restore power to the
appliance and confirm proper operation.
Only replace fuses with identical parts, see Figure 15-1. Failure to follow this warning
may result in component failure, fire, property damage, serious injury or death.
User Interface (LCD Dot-Matrix Display)
The User Interface (display) provides the communication between the boiler controller and the user. If the
communication fails, the User Interface will display, “Boiler Search, Modbus address: 1,2,3…” indefinitely,
if the display loses power (or fails completely) the screen will appear blank. To troubleshoot these issues
perform the following procedures:
Blank Screen
1. Confirm that 120VAC is being supplied to the boiler and that the service switch located below the display is
turned ON (1).
2. Remove the front cover from the boiler; confirm that the green “power” light is illuminated on the boiler
controller (Sola). If the light is NOT illuminated check the 24VAC fuse (Step 3); if the light is illuminated,
proceed to Step 4.
3. Remove the control panel cover and check Fuse “C” (Auto Blade Type); if faulty check for shorts in the
thermostat wiring, correct, then replace fuse (see Figure 15-1).
4. Ensure the Molex connector, located behind the display at the top, is connected and that the wires are fully
inserted (see Figures 15-2 and 15-3). Verify that 5VDC is present between the Red and Black wires; if not
trace wiring back to the boiler controller (see Figure 12-1); check for 5VDC at boiler controller (Sola).
5. Remove the display assembly from the control panel and check the wiring connections (see Figure 15-3).
Loss of Communication
Fuse “C” ATO 2A
32V Auto Blade Type
Fuses “A” and “B” 3AG
7A 250 Fast-Acting
Control Panel Cover
Control Panel