ES
FR
ENG
IT
51
4.7
FAULT FINDING
The main burner does not ignite.
–. This. means. that. the. flue. smoke. stat.
has.tripped.off.(point.3.3).
–. Make. sure. power. arrives. to. the. gas.
valve.
–. Replace. the. electric. operator. of. the.
valve..
–. Replace.the.valve.
The boiler reaches the set temperature,
but the radiators do not heat up.
–. Make.sure.there.are.no.air.bubbles.in.
the. system,. if. so. purge. from. appro-
priate.air.vents.
–. The. room. stat. is. too. low. or. must. be.
replaced.if.faulty.
–. The. connections. of. the. room. stat. are.
not.correct.(make.sure.the.cables.are.
placed.on.terminals.6.and.7.of.the.boi-
ler.terminal.board).
Boiler operates only at nominal pressu-
re and does not reduce pressure.
–. Check.whether.there.is.voltage.at.both.
ends.of.coil.
–. The. coil. has. a. break. in. the. winding;.
replace.
–. The.rectifier.card.that.supplies.the.coil.
is.interrupted;.replace.
–. There. is. no. differential. on. setting. of.
the. two. contacts. of. the. regulating.
thermostat;.replace.
–. Check.calibration.of.reduced.pressure.
adjusting.screw.of.coil.assembly.
The boiler gets dirty easily causing sca-
ling of cast iron exchanger and cutting
off of smoke stat.
–. Check. that. the. flame. of. the. main.
burner.is.well.regulated.and.that.gas.
consumption. is. proportional. to. boiler.
output.
–. Poor. ventilation. of. premises. where.
boiler.is.installed.
–. Flue. with. insufficient. draught. or. not.
meeting.requirements.
–. The.boiler.works.at.too.low.tempera-
tures..Adjust.the.boiler.thermostat.to.
higher.temperatures.
Thermostat switches boiler back on
with too high temperature difference.
–. Replace.regulating.thermostat.since.it.
is.out.of.calibration.
KEY
. 1. Boiler.body
. 2. Burner
. 3. Main.nozzle
. 4. Aluminium.washer
. 5. Burner.manifold
Fig..13
