State GPG 81 370NEA - Manual (Page 32)

32
figure 30.
serVice
The installer may be able to observe and correct certain problems
which may arise when the unit is put into operation. HOWeVer,
it is recommended that only a qualified service technician or
qualified agencies, using appropriate test equipment, be allowed
to service the heater.
As preliminary step, check wiring against diagram, check for
grounded, broken or loose wires. Check all wire ends to be sure
that they are making good contact.
electrical serVicing
lABel All WIreS PrIOr TO DISCONNeCTION WHeN SerVICING
CONTrOlS. WIrING errOrS CAN CAuSe ImPrOPer AND
DANGerOuS OPerATION.
VerIFy PrOPer OPerATION AFTer SerVICING.
gas control ValVe
Figure 30 shows the combination gas control valves used on
these heaters.
If gas control valve becomes defective, repairs should not
be attempted. A new valve should be installed in place of
defective one.