3
mexico HE
-
Users
Control of water temperature
The boiler controls the central heating radiator temperature to a
maximum of 82
0
C, adjustable via the CH thermostat knob (B).
Approx. CH flow temperatures for the boiler thermostat settings
are:
Knob setting
Flow Temperature
o
C
o
F
Minimum
30 86
Maximum
82 180
To shut down the boiler
1. For short periods
Set the mains on/off switch (A) to OFF.
2. For longer periods
Set the mains on/off switch (A) to OFF. Switch the electricity
supply to OFF. For longer periods the entire system should be
drained, including the domestic hot water supply.
To relight the boiler
Repeat the procedure detailed in ‘To light the boiler’.
Frost protection
if no frost protection is provided and frost is likely during a short
absence from home leave the heating controls (if fitted) at a
reduced temperature setting.
For longer periods the entire system should be drained.
if the system includes a frost thermostat then, during cold
weather, the boiler should be turned
OFF
at the time switch (if
fitted) ONLy. The mains supply should be left switched
ON,
with
the boiler thermostat left in the normal running position.
Boiler Overheat Thermostat
This thermostat will shut down the boiler in the event of
overheating. Should this occur a fault code ‘
L-A
’ will be displayed.
Press the reset button (C) and the boiler will relight. if the fault
recurs turn off the boiler and consult a Gas Safe Registered
Engineer or in iE a Registered Gas installer.
Flame failure
Should this occur a fault code ‘
L-F
’ will be displayed. Press the
reset button and the boiler will relight. if the fault recurs, turn off
the boiler and consult a Gas Safe Registered Engineer or in iE a
Registered Gas installer.
Condensate Drain
This appliance is fitted with a siphonic condensate trap system that
reduces the risk of the appliance condensate from freezing. However
should the condensate pipe to this appliance freeze, please follow
these instructions:
a. if you do not feel competent to carry out the defrosting
instructions below please call your local Gas Safe Registered
installer for assistance.
b. if you do feel competent to carry out the following instructions
please do so with care when handling hot utensils. Do not
attempt to thaw pipework above ground level.
if this appliance develops a blockage in its condensate pipe, the
condensate will build up to a point where it will make a gurgling
noise prior to locking out an “L2” fault code. if the appliance is
reset it will make a gurgling noise prior to it locking out on a failed
ignition “L2” code.
To unblock a frozen condensate pipe;
1. Follow the routing of the plastic pipe from its exit point on the
appliance, through its route to its termination point.
Locate the frozen blockage. it is likely that the pipe is frozen
at the most exposed point external to the building or where
there is some obstruction to flow. This could be at the open
end of the pipe, at a bend or elbow, or where there is a dip in
the pipe in which condensate can collect. The location of the
blockage should be identified as closely as possible before
taking further action.
2. Apply a hot water bottle, microwaveable heat pack or a warm
damp cloth to the frozen blockage area. Several applications
may have to be made before it fully defrosts. Warm water can
also be poured onto the pipe from a watering can or similar.
DO NOT use boiling water.
3. Caution when using warm water as this may freeze and cause
other localised hazards.
4. Once the blockage is removed and the condensate can flow
freely, reset the appliance (Refer to “To Light the boiler”)
5. if the appliance fails to ignite, call your Gas Safe Registered
engineer.
preventative solutions
During cold weather, set the boiler stat to maximum, (Must return to
original setting once cold spell is over)
Place the heating on continuous and turn the room stat down to 15ºC
overnight or when unoccupied. (Return to normal after cold spell).
CAUTION.
To avoid the possibility of injury during the installation, servicing or cleaning of
this appliance care should be taken when handling edges of sheet steel components.
Legend
A
Boiler on/off switch
B
CH thermostat knob
C
Reset button
D
LED
E
Display
1
BOiLEr COnTrOLS
mhe7554
E
C
D
B
A
