Energy Tech Laboratories MR212 Manual Do Utilizador

 

22

Problem 

Corrective Action 

Pilot Does Not Light/Stay Lit 

Main gas if off 

Open main gas valve 

Air in gas line 

Purge gas line 

Dirt in pilot orifice 

Clean orifice with compressed air 

Gas pressure out of range 

Adjust to proper gas pressure 

Pilot valve is off 

Turn pilot valve on 

Pilot orifice fitting leak 

Tighten pilot orifice 

Excessive drafts 

Re-direct draft away from unit 

Safety device has cut power 

Check limits and airflow switch 

Dirty flame sensor 

Clean flame sensor 

Remote panel in “Vent” mode 

Change to “Heat” mode 

No spark at igniter 

Check wiring, sensor, and ignition 
controller.  Check spark gap as shown 
below. 

Main Burner Does Not Light 
(Pilot is Lit) 

Defective valve 

Replace combination valve 

Loose valve wiring 

Check wiring to valve 

Defective pilot sensor 

Replace pilot sensor 

Shut off valve closed 

Open shut off valve 

Defective flame safety controller 

Replace flame safety controller 

Pilot fails as main gas valves open 
and main gas begins to flow 

Plug the first burner port next to the 
pilot gas tube with burner cement 

Not Enough Heat 

Main gas pressure too low 

Increase main gas pressure – do not 
exceed 14 in. w.c. inlet pressure (5 psi. 
on size 4-5 heater) 

Too much airflow 

Decrease airflow if possible 

Burner undersized 

Check design conditions 

Gas controls not wired properly 

Check wiring 

Thermostat setting too low 

Increase thermostat setting 

Thermostat malfunction 

Check/replace thermostat 

Unit locked into low fire 

Check wiring 

Too Much Heat 

Defective modulating gas valve 

Check/replace modulating valve 

Thermostat setting too high 

Decrease thermostat setting 

Unit locked into high fire 

Check wiring 

Thermostat wired incorrectly 

Check thermostat wiring