Groen HY-12GF(CE), Operator Manual & Service Manual

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36 OM/SM-HY-12GF(CE) & HY-24GF(CE)
3.4.4 Problem: Steamer Cavity Does Not Achieve “Ready” Status — Continued
PROBABLE CAUSES CORRECTIVE ACTION
Drain valve open (normally open valve) Check / replace drain valve. Check for 20 VDC minimum at drain
valve connector and that TR1 output is 22 VAC minimum.
Improper drain valve operation. Check/replace water level board.
Steam generator ready thermostat malfunction Test thermostat for shorted or open condition. Replace thermostat.
Thermostat opens on temperature rise
Door open Close door. Make sure door is secured by latch. Check door
adjustment.
Door switch malfunction Check door switch connectors to wiring harness. Check switch for
continuity using magnet. Check position of magnet in door.
Low gas pressure supply Check gas supply.
Gas manifold burners do not ignite Check/replace low/high fire gas solenoids. Check connections and
solenoid operation
3.4.5 Problem: Boiler Overfills
Water level probe circuit Probe encrusted with lime. Clean probes. Check connections to
probes for open circuit.
Water inlet valve not closing
(Valve is normally closed)
Check inlet valve for debris in diaphragm which would keep valve
open. Replace if necessary.
Water board not grounded properly Perform continuity check and restore ground to water level control
board.
Water board Replace water level control board.
3.4.6 Problem: Water Leaks
Leaks around water inlet valve Check/tighten hose clamps. Defective gasket in hose connection.
Replace gasket.
Cracked water inlet valve housing Replace water inlet valve
Leaks around heating elements and steam
generator inlet fittings
Replace gasket, tighten fittings. Check for loose nuts.
Leaks at drain box Check/tighten hose clamps
Leaks at drain box overflow Check/clear blockage in drain
3.4.7 Problem: Improper Condensate Spray Operation
No condensate spray - Steam coming out vent Check for defective spray water valve. Replace as required.
Too much condensate spray Excessive water coming out of drain. Check incoming water line
pressure. Correct pressure if necessary. Defective or missing spray
nozzle or orifice.
Continuous condensate spray Solenoid stuck in open position. Check solenoid. Door switch stuck
in closed position. Check switch.