Instruction manual

48
D TROUBLESHOOTING
The pump switch is in winter mode
Is the heater temperature (shown
on gauge) up to 140°F (60°C) ?.
Is the room thermostat calling for
heat ?.
No
DL6 lamp diode is lit
Yes
The light of the pump-switch is not on.
- Check if the heater temperature control is set at a minimum
of 140°F (60°C). If is already up to 140°F (60°C) replace the
heater temperature control.
No
The DL6 lamp diode is not lit.
- Check if the room thermostat is wired properly.
- Check T-T inputs Thermostat 24Vac on the white junction box
attached to the heater cavity. Jump across terminals to see if
the pump starts.
If it does, the problem is external of the boiler.
Yes
Turn the central heating regulation
knob to the maximum setting.
Is the pump running ?.
The pump is not running. The radiators will be cold.
- Check if the pump is locked or jammed in its position.
This may be due to the pump not running throughout the
summer. In this case, turn the screw on top of the pump with
flat head screwdriver to help loosen the pump impeller.
- Check for power to the pump by checking for 110VAC
between terminals 15 and 16 on the main electrical control
board.
If pump is still not operational, remove cover on pump and
check for power between N and L terminals. If 110VAC is
obtained, replace pump cartridge by removing the four allen
screws.
No
Yes
Are the radiators hot ?.
- Check if the zone valves are open.
- Check if you have air in the radiators (purge from the radiators)
- Check if you have air in the heater (loosen the cap of
automatic air vent)
No
Pump runs until thermostat is
satisfied or the temperature inside
the heater is less than
140°F (60°C)
Yes
Troubleshooting Sequence of Operation for a Call for Heat
Troubleshooting Sequence of Operation for Domestic Hot Water
Start
The temperature inside the heater
is set more than 122°F
(
50°C
)
Is the domestic hot water side hot?.
No
Yes
- Check if the external mixin
g
valve is installed correctl
y
and
that it is set more than 104°F
(
40°C
)
- Check if the domestic hot water coil is dirt
y
(
domestic side
)
- Check if the domestic hot water exchan
g
er is dirt
y
(
heatin
g
s
y
stem side
)
- Check if the domestic hot water flow restrictor is correctl
y
set
(
see TABLE 1 DHW output rise
)
OK