Check for 240vac at power cord terminal block. If good and wiring there looks good, no burning/melting loose connections, current path is via motor switch, hi limit thermostat, operating thermostat, heat selector switch terminals L1 to C and timer terminals L to H. Really need to troubleshoot this via voltage drop method, versus continuity tests. Heat circuit carries 20 amps of current which can cause a faulty contact to break down yet still read ok with simple continuity check.

Eric