Is it possible to repair gas heating boilers with your own hands?

Gas boil­er plants are the most pop­u­lar devices for heat­ing and cre­at­ing hot water sup­ply for pri­vate and mul­ti-apart­ment build­ings. This equip­ment is func­tion­al, reli­able and with prop­er care can serve its own­er for decades. But, any tech­nique has an unpleas­ant prop­er­ty to break, and at the most inop­por­tune moment.

Accord­ing to the safe­ty rules, the repair of gas boil­ers must be car­ried out by per­son­nel who have been trained and have a gas man­age­ment per­mit for this. There are cas­es when a gas boil­er repair­man is not “at hand” or a break­down of the boil­er plant is not relat­ed to the “gas com­po­nents” of the heat­ing sys­tem (CO). Know­ing the main caus­es of break­downs of a gas boil­er, you can always repair it on your own, with­out involv­ing expen­sive spe­cial­ists in this process.

What do you need to know?

Before you start self-repair­ing a gas boil­er at home, you need to famil­iar­ize your­self with the main com­po­nents of the boil­er instal­la­tion and automa­tion, since it is the safe­ty group that most often caus­es the fail­ure of the gas boil­er.Gas boiler components

  1. Thrust sen­sor — reacts to flue gas tem­per­a­ture changes. The oper­a­tion of the boil­er automa­tion due to the lack of trac­tion occurs when the tem­per­a­ture of the exhaust gas­es ris­es above 75 ° C.
  2. A safe­ty valve, or, as experts call it, a blast valve. This device dumps excess coolant when the set pres­sure thresh­old is exceed­ed.
  3. Ther­mo­stat (lim­it). Even by the name, the pur­pose of the device is clear: con­trol over the max­i­mum tem­per­a­ture of the coolant in the cir­cuit of the boil­er plant.
  4. The elec­trode respon­si­ble for con­trol­ling the flame in the com­bus­tion cham­ber. In the absence of a flame, the com­bus­tion cham­ber is filled with gas. Even one spark is enough to cause an explo­sion of the boil­er plant. To pre­vent this from hap­pen­ing, the elec­trode gives a com­mand to the con­troller, which, in turn, con­trols the gas valve, shut­ting off the fuel sup­ply to the burn­er.

In tur­bocharged heat­ing equip­ment, anoth­er ele­ment is installed that belongs to the safe­ty group — this is a mono­stat, which is respon­si­ble for the speed of exhaust gas­es. This device is very use­ful in case of dete­ri­o­ra­tion of smoke removal due to a clogged chim­ney or an air tur­bine fail­ure.

Impor­tant! Automa­tion is respon­si­ble for the cor­rect oper­a­tion of the gas boil­er. We strong­ly do not rec­om­mend repair­ing automa­tion, replac­ing its com­po­nents and set­ting up their work on your own. It is best to entrust the repair and main­te­nance of gas boil­ers to spe­cial­ists.

There is a list of prob­lems in gas boil­ers, most of which any home mas­ter can han­dle.

Impor­tant! If you smell gas or notice smoke in the boil­er room, imme­di­ate­ly turn off the gas sup­ply to the boil­er plant, turn off the pow­er to the equip­ment, open the win­dows and leave the room until the gas ser­vice spe­cial­ists arrive.

heat exchanger

Experts right­ly con­sid­er the heat exchang­er to be the com­po­nent that needs the most main­te­nance. The first prob­lem is soot deposits on the coil, which sig­nif­i­cant­ly reduces heat trans­fer. The sec­ond prob­lem is more seri­ous — scale, which (when using hard water) set­tling on the inner sur­faces of the pipeline, reduces its flow area, and, con­se­quent­ly, the cir­cu­la­tion of the coolant.

With a decrease in the cross sec­tion of the coil, the fol­low­ing increas­es sig­nif­i­cant­ly:

  • dynam­ic pres­sure in the boil­er cir­cuit (caus­es prob­lems with seals and leaks at the junc­tion of the pipeline and ele­ments).
  • load on the cir­cu­la­tion pump (may lead to com­plete fail­ure).

heat exchangerSelf-repair of gas heat­ing boil­ers must begin with clean­ing the heat exchang­er from soot. To car­ry out this oper­a­tion, you should “arm your­self” with a paint brush and a met­al sponge (kitchen sam­ple).

air turbine

Bear­ings are the most prob­lem­at­ic part of any fan. Due to the increase in the coef­fi­cient of fric­tion in the bear­ing, the heat­ing increas­es and the speed of rota­tion of the rotor, and hence the blades, is sig­nif­i­cant­ly reduced. There is anoth­er rea­son for the heat­ing of the hous­ing asso­ci­at­ed with a decrease in the per­for­mance of an air tur­bine — an inter-turn cir­cuit.Turbine

In the first case, repairs can be done by hand by spin­ning the device and lubri­cat­ing the bear­ing with “graphite”, or any oth­er high-tem­per­a­ture-resis­tant grease. In case of prob­lems with the motor wind­ing, it is unlike­ly that it will be pos­si­ble to solve this issue with­out the inter­ven­tion of spe­cial­ists.

Settings failure

Set­tings are a “trou­ble” that can affect the own­ers of almost all volatile boil­er plants, regard­less of the man­u­fac­tur­er and brand of equip­ment. The prob­lem may be in the volt­age drop, which led to the fail­ure of the set­tings. But, most often — the boil­er starts to work inad­e­quate­ly after the inter­ven­tion of the own­er or “unfor­tu­nate repair­men” from the near­est work­shop.

Tip: Self-repair of the con­trol board of a gas boil­er is a thank­less task: any prob­lem asso­ci­at­ed with elec­tron­ics can lead to fail­ure of the boil­er instal­la­tion or, worse, to an emer­gency. Entrust com­pe­tent adjust­ment of the boil­er to pro­fes­sion­als.

Why does the boiler not turn on?

Quite often, the boil­er does not start due to a clogged chim­ney. Solve the prob­lem sim­ply by dis­as­sem­bling the chim­ney into its com­po­nents, and clean­ing them of debris and soot.

Tip: if you do not want to wash fur­ni­ture, floors, walls and ceil­ings of the boil­er room from soot, as well as a cat that has run into the room, per­form all dis­as­sem­bly and clean­ing oper­a­tions with the vac­u­um clean­er turned on.

The boil­er may not turn on due to fail­ure or incor­rect oper­a­tion of the gas valve. Diag­nos­tics can be car­ried out quite sim­ply: it is nec­es­sary to deter­mine whether the boil­er is con­nect­ed to the mains and whether gas is sup­plied to the burn­er. If every­thing is in order, then the prob­lem is in the con­trol board or in the valve. Repair­ing the gas valve of a gas boil­er with your own hands is an oper­a­tion, although not the most dif­fi­cult, but extreme­ly respon­si­ble, which can only be entrust­ed to pro­fes­sion­als.

And as a con­clu­sion: it should be remem­bered that the best mea­sure to pre­vent boil­er break­downs is reg­u­lar main­te­nance. It is best to do it twice a year: before and after the heat­ing sea­son.


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