16
Problem
Cause
Solution
No heat when called by
thermostat and “TT” LED
is NOT lit
Thermostat
Disconnect thermostat from control, momentarily place a jumper across
terminal “TT” & “TT.” If circulator starts, trouble is in thermostat.
No power to board
Confirm control’s On/Off switch is in “ON” position, check 15A circuit
breaker or fuse.
“Circ” LED is NOT lit
when thermostat is call-
ing
Safety fault
Check for open contact on safety’s. Confirm continuity across terminals.
No power to board
Confirm control’s On/Off switch is in “ON” position
“Safety Switch” LED is
NOT lit when thermostat
is calling
Safety fault
Check for open contact on safety’s. Confirm continuity across terminals.
No power to board
Confirm control’s On/Off switch is in “ON” position.
“FAULT” LED is flashing
Safety fault
Refer to “Fault” codes
TrouBLEsHooTing
!
WARNING
Take extreme care when boiler cover is
removed. Turn “OFF” all service to boiler.
"Power On” checks should be made by
qualified electrician.
Heating element change, use following procedure:
Check water pressure of boiler. Should be 15-25 PSIg.
1.
Check for air within system.
2.
This section is to assist service technician when
trouble shooting electric boiler. It is important to
isolate before proceeding. Control error codes can be
helpful identifying cause of problem. If you suspect
wiring fault, check all external wiring and wiring
connections following wiring diagram label on inside
of boiler's cover. Additional wiring diagram is included
with this manual.
Turn off hydronic unit circuit breaker at service en-
1.
trance and/or disconnect switch.
Close gate valves near inlet and outlet of hydronic
2.
block.
noisy BoiLEr
HEATing ELEmEnT cHAngE
When thermostat calls for heat, circulator will be
8.
energized and indicator LED will light. Heating elements
are energized with element indicator LEDs. Once boiler
water temperature reaches set point on temperature
adjustment dial, controller will regulate boiler by
staging its elements. Number of elements which stay
on is based on heating demand and set point of boiler
water temperature. After all room thermostats are
satisfied with heat, controller de-energizes elements
one after another, and switches pump off after 3
minutes
.
THErmosTAT insTALLATion
3.
Close feed line valve if using automatic fill.
Open drain valve and allow water to drain from boiler.
4.
Manual operation of relief valve will assist drainage by
allowing air to enter.
Remove cabinet cover and disconnect two wires
5.
attached to effected heating element.
Remove four bolts securing heating element to casting
6.
pry element loose. Take note of markings on element
flange to assure proper reinstallation.
After element has been removed, carefully clean any
7.
remaining gasket material from casting surface. Take
care not to scratch or score surface.
Install new gasket and heating element while assuring
8.
element is correctly positioned.
Close relief valve. Open feed line valve and check for
9.
leaks. Open gate valves. Install heating element wires
and cabinet cover.
Refer to "Startup and Seasonal Maintenance" for proper
10.
purging of air prior to energizing heating elements.